JP2021095658A - Method of waterproof treatment for article made of fiber, and method of manufacturing waterproof article made of fiber - Google Patents

Abstract

To provide a technique capable of effectively preventing the inconvenience of visual recognition from the outside by oozing a body fluid excreted from a body onto a clothing without giving uneasiness about effectiveness thereof.SOLUTION: The method of waterproof treatment for an article made of fiber of the present invention includes a surface treatment step of attaching a waterproofness-giving agent onto a skin non-contacting face 2b of a hydrophilic fiber sheet 2 capable of contacting the skin of a user when using, of an article 1 made of fiber provided with the fiber sheet 2. While forming a skin non-contacting side waterproof region 3 having a contact angle with water of 0 degree or more and 70 degrees or less on the skin non-contacting face 2b of the fiber sheet 2 by the surface treatment step, the hydrophilicity of a region corresponding to the skin non-contacting side waterproof region 3 on a skin contacting face 2a of the fiber sheet 2 is maintained, and the bending stiffness value of the fiber sheet 2 in the skin non-contacting side waterproof region 3 is made as 1.2 times or more and 4.0 times or less in comparison to before attaching the waterproof-giving agent.SELECTED DRAWING: Figure 1

Description

The present invention relates to a waterproof treatment technique for hydrophilic textile articles.

Conventionally, surface treatment such as waterproofing is applied to textile articles represented by various kinds of clothing. According to Patent Document 1, there is no sticky feeling even if a large amount of sweat is applied when worn, and as a cloth suitable for sports clothing, inner clothing, etc., the surface of the cloth absorbs water in a sea-like portion having water repellency. A fabric having a configuration having a plurality of island-shaped portions having a plurality of island-shaped portions and having an area per island-shaped portion and a total area ratio of the island-shaped portions on the surface set within a specific range is described. The fabric described in Patent Document 1 is produced by subjecting the surface of a water-absorbent fabric to a printing process by a known method such as a rotary screen printing method using various water repellents such as fluorine-based and silicone-based. To.

In addition, urine remaining in the urethra after urination may slowly come out and wet inner clothing such as underwear. This is a phenomenon called "Post Micturition Dribble (PMD)", and it is also called "a little leak" because the amount of urine is as small as 0.1 mL to 2 mL compared to urinary incontinence. Males have a longer urethra than females, and males have a structure in which the urethra is bent at two points, so urine tends to remain in the urethra. Therefore, men are especially prone to leaks. A small leak not only causes discomfort due to the wetness of inner clothing such as pants, but also may cause urine to seep out from the top of the inner clothing to the outer clothing such as pants worn. Depending on the type of color, there is a problem that the urine stain becomes conspicuous. Incontinence pads have been proposed to address the problems caused by such small leaks, but many people are reluctant to use incontinence pads and take measures against small leaks without using incontinence pads. The reality is that there is a strong desire to do so.

As a method of preventing urine stains on the outer garment, it is conceivable to treat the inner garment with a commercially available waterproof spray to impart water repellency to the inner garment so that the urine generated by a slight leak does not transfer to the outer garment. However, since most of the commercially available waterproof sprays maintain the water-repellent effect for a long time, the active ingredient such as silicone that contributes to the development of the water-repellent effect is configured to firmly adhere to the object to be treated. When the inner garment treated with a waterproof spray is washed with a washing machine or the like after being worn, the active ingredient may remain without being removed, which poses a hygienic problem.

The applicant first sprayed the non-skin facing surface (opposing surface to the outer clothing) of the water-absorbing fiber article as a water-repellent fiber article capable of effectively preventing urine stains on the outer clothing. We have proposed a water-repellent region formed on the non-skin side by attaching a water-repellent agent to the skin (Patent Document 2). The water-repellent fiber article maintains the water absorption inherent in the fiber article at a portion overlapping the non-skin side water-repellent region in a plan view and closer to the user's skin than the non-skin side water-repellent region. It has a water-absorbent layer, that is, it has a portion where the non-skin facing surface side is water repellent and the skin facing surface side is water absorbing.

Japanese Unexamined Patent Publication No. 2012-1206036 International Publication No. 2018/225286

According to the technique described in Patent Document 2, urine stains on outer clothing due to slight leakage can be achieved by simply applying a water-repellent imparting agent to the non-skin facing surface of inner clothing, which is a textile article. A water-repellent fiber article that is less likely to cause the above can be obtained. However, since the adhesive portion of the water-repellent imparting agent is at first glance indistinguishable from the non-adherent portion of the water-repellent imparting agent around it, a person who has undergone surface treatment (typically, an article made of water-repellent imparting fiber) The wearer) is anxious about the effect even though the surface treatment actually exerts a sufficient effect of preventing urine stains, and due to the anxiety, an excessive amount of water-repellent imparting agent is applied. It sometimes adhered. In order to prevent such inconvenience, a method of coloring the water-repellent imparting agent in a color different from that of the object to be imparted so that the adhered portion and the non-adhered portion of the water-repellent imparting agent can be easily distinguished at a glance. Can be considered. However, there are many people who are reluctant to color inner clothing such as pants, even if only part of it, and the colored part of the inner clothing, that is, the part where the water-repellent imparting agent is attached becomes visible through the outer clothing. That is an undesired situation.

Therefore, the subject of the present invention is a technique that can effectively prevent the inconvenience that the body fluid excreted from the body exudes into the clothes and becomes visible from the outside, and does not give anxiety to the user about its effectiveness. Regarding providing.

The present invention is a waterproof treatment method for waterproofing the fiber sheet of a textile article provided with a hydrophilic fiber sheet that can come into contact with the user's skin during use, and is applied to a non-skin facing surface of the fiber sheet. It has a surface treatment step of attaching a waterproofing agent, and the surface treatment step forms a non-skin side waterproof region having a contact angle with water of 0 degrees or more and 70 degrees or less on the non-skin facing surface of the fiber sheet. At the same time, the hydrophilicity of the region corresponding to the non-skin side waterproof region on the skin-facing surface of the fiber sheet is maintained, and the bending rigidity value of the fiber sheet in the non-skin side waterproof region is set to the adhesion of the waterproofing agent. This is a waterproofing method for textile articles, which is 1.2 times or more and 4.0 times or less compared to the previous method.

Further, the present invention is a method for manufacturing a waterproofing fiber article, wherein a fiber article provided with a hydrophilic fiber sheet that can come into contact with the user's skin at the time of use is provided on a non-skin facing surface of the fiber sheet. It has a surface treatment step to attach a waterproofing agent, and the surface treatment step forms a non-skin side waterproof region having a contact angle with water of 0 degrees or more and 70 degrees or less on the non-skin facing surface of the fiber sheet. At the same time, the hydrophilicity of the region corresponding to the non-skin side waterproof region on the skin-facing surface of the fiber sheet is maintained, and the bending rigidity value of the fiber sheet in the non-skin side waterproof region is set before the waterproofing agent is attached. This is a method for manufacturing a waterproofing fiber article, which is 1.2 times or more and 4.0 times or less as compared with the above.

According to the present invention, it is possible to prevent the inconvenience that the body fluid excreted from the body exudes into the clothes and becomes visible from the outside, and it is possible to obtain a waterproof fiber article which does not give anxiety to the user about its effectiveness. Be done.

FIG. 1 is a diagram schematically showing an embodiment of the waterproof treatment method for textile articles of the present invention (hereinafter, also simply referred to as “waterproof treatment method”). FIG. 1 is also an embodiment of the method for manufacturing a waterproof fiber article of the present invention (hereinafter, also simply referred to as “manufacturing method”). FIG. 2 is a diagram schematically showing a wearing state of waterproofing pants, which is an embodiment of a waterproofing fiber article obtained by the waterproofing treatment method or manufacturing method of the present invention. FIG. 3 is a diagram schematically showing a state in which another clothing is worn over the waterproofing-imparting pants shown in FIG.

Hereinafter, the present invention will be described based on the preferred embodiment with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

First, a textile article which is a waterproof treatment target of the waterproof treatment method of the present invention and is used as a raw material in the production method of the present invention will be described.
The textile article used in the present invention comprises a hydrophilic fiber sheet that can come into contact with the user's skin during use. The fiber sheet is mainly composed of hydrophilic fibers. The content of hydrophilic fibers in the fiber sheet is preferably 50% by mass or more, more preferably 70% by mass or more, and may be 100% by mass, that is, the fiber sheet may be composed of only hydrophilic fibers.

Hydrophilic fibers include wood pulp such as coniferous pulp and broadleaf pulp, natural fiber such as non-wood pulp such as cotton pulp and hemp pulp; modified pulp such as cationized pulp and marcelled pulp; recycled fiber such as cupra and rayon. Semi-synthetic fibers such as acetate; Hydrophilic synthetic fibers such as polyvinyl alcohol fiber and polyacrylonitrile fiber; Fibers obtained by hydrophilizing synthetic fibers such as polyethylene terephthalate fiber, polyethylene fiber, polypropylene fiber and polyester fiber. , One of these can be used alone or in combination of two or more. The synthetic fiber may be a single fiber composed of one kind of synthetic resin or a blend polymer in which two or more kinds of synthetic resins are mixed, or may be a composite fiber.

The form of the fiber sheet is not particularly limited, and may be, for example, a woven fabric (woven fabric), a knitted fabric, a non-woven fabric, or paper. In the case of woven fabrics and knitted fabrics, the weaving method and knitting method are not particularly limited. Examples of the woven fabric include woven fabrics such as plain weave, twill weave, and satin weave. Examples of knitted fabrics include flat knitting, rubber knitting, pearl knitting, double-sided knitting, and other flat knitting; single tricot knitting, single cord knitting, half tricot knitting, plain tricot knitting, and queen's cord knitting. Be done. Examples of the non-woven fabric include air-through non-woven fabric, spunbond non-woven fabric, spunlace non-woven fabric, melt blown non-woven fabric, resin bond non-woven fabric, and needle punch non-woven fabric. The fiber sheet may have a single-layer structure or a laminated structure in which a plurality of layers are laminated.

The fiber sheet has water absorbency and can absorb water and various aqueous liquids. Therefore, the textile article composed of the fiber sheet also has water absorption and can absorb body fluids excreted from the body such as sweat, urine, and blood. The water absorption time of the fiber sheet (textile article) by the dropping method of JIS L-1907 is preferably 30 seconds or less, more preferably 20 seconds or less, still more preferably 15 seconds or less. The water absorption of the fiber sheet (textile article) can be adjusted by appropriately adjusting the type and content of the hydrophilic fibers contained in the fiber sheet.
The outline of the dropping method, that is, "JIS L-1907 water absorption test method for textile products (dropping method)" is as follows. A drop of water is dropped from the burette onto the textile product (test piece), and from the time the water drop reaches the surface of the test piece, the specular reflection disappears as the test piece absorbs the water drop, leaving only wetness. Measure the time until 1 second with a stopwatch, and evaluate the water absorption by the length of the measurement time.

The textile article (fiber sheet) used in the present invention may satisfy, for example, the following characteristics.
-The cotton mixing ratio is preferably 5% by mass or more, more preferably 10% by mass or more. The cotton-blended ratio here is the mass ratio of water-absorbent fibers such as cotton contained in the textile article (fiber sheet).
The basis weight is preferably 70 g / m ² or more, more preferably 85 g / m ² or more.

The following can be exemplified as specific examples of the textile article used in the present invention.
Inner clothing represented by underwear such as pants, 褌, shirts, brassieres, girdles, socks; soccer shirts, golf shirts, tennis shirts, basket shirts, table tennis shirts, badminton shirts, running shirts, soccer pants, tennis pants, basket pants. , Table tennis pants, badminton pants, running pants, golf pants, various sports underwear, various sports innerwear, sweaters, T-shirts, jerseys, trainers, windbreakers, shorts, leggings and other sports clothing; urine leakage treatment Light incontinence supplies such as padding, sanitary napkins, panty liner and other cage sheets, breast milk pads, etc.

The waterproof treatment method of the present invention and the manufacturing method of the present invention will be described. Both methods are common in that they have a surface treatment step of attaching a waterproofing agent to the non-skin facing surface of the fiber sheet. Both methods typically have only the surface treatment step, and can efficiently produce a waterproofing fiber article without the need for large equipment or complicated procedures. Both methods can be carried out not only industrially, but also personally or at home.

FIG. 1 shows an embodiment of the surface treatment step according to the present invention. In the form shown in FIG. 1, men's pants 1 are used as the textile article. The men's pants 1 are men's trunks-type pants, which are inner clothing, and have a front body, a back body, and a crotch portion located between the two, as well as a waist opening and a pair of leg openings. Men's pants 1 are so-called front-closed trunks that do not open at the front, and elastic members are provided at the waist ends that define the waist opening, such as by arranging thread-like elastic members. There is. The men's pants 1 is mainly composed of a hydrophilic fiber sheet 2, and the front body, the back body, and the crotch portion of the men's pants 1 are each composed of the fiber sheet 2.

In the form shown in FIG. 1, the waterproofing agent is sprayed onto the non-skin facing surface 2b of the fiber sheet 2 of the men's pants 1 using a spray-type discharge container 4, so that the waterproofing agent is sprayed on the non-skin facing surface 2b. (Surface treatment process). By this surface treatment step, the non-skin side waterproof region 3 is formed on the non-skin facing surface 2b of the fiber sheet 2 of the men's pants 1, and the men's pants 1 which is a textile article is a waterproof-imparting fiber article. It becomes waterproofing pants 5.

FIG. 2 shows the wearing state of the waterproofing pants 5. The waterproofing pants 5 are basically in a state before the waterproofing agent is attached, that is, men's pants 1, except that the non-skin side waterproof region 3 is formed on the non-skin facing surface 2b of the fiber sheet 2. And can be used in the same way as men's pants 1. FIG. 3 shows a state in which outer clothing 20 such as trousers is layered on top of the waterproofing pants 5 worn by the wearer (user) indicated by reference numeral 10. In the waterproofing pants 5, the skin facing surface 2a of the fiber sheet 2 forms the skin facing surface (inner surface) of the waterproofing pants 5, and can come into contact with the skin of the wearer 10 when the waterproofing pants 5 are worn. .. The non-skin facing surface 2b of the fiber sheet 2 forms the non-skin facing surface (outer surface) of the waterproof-imparting pants 5, and when the waterproof-imparting pants 5 are worn, such as outer clothing 20, from above the waterproof-imparting pants 5. Can come into contact with other garments that are layered.

In the present specification, the "skin facing surface" is a surface of the textile article or its constituent members (for example, a fiber sheet) that is directed toward the wearer's skin when the textile article is worn, that is, relative to the wearer's skin. The "non-skin facing surface" is the surface of the textile article or its constituents that faces the side opposite to the skin side when the textile article is worn, that is, relatively far from the wearer's skin. On the side. The term "when worn" as used herein means a state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained.

As the first feature of the waterproofing pants 5, a non-skin side waterproof region 3 having a contact angle with water of 0 degrees or more and 70 degrees or less is formed on the non-skin facing surface 2b of the fiber sheet 2, and the fiber sheet 2 The region 21 corresponding to the non-skin side waterproof region 3 on the skin facing surface 2a (the region overlapping the non-skin side waterproof region 3 in a plan view, that is, the back surface of the non-skin side waterproof region 3) is hydrophilic (water absorption). ). That is, the fiber sheet 2 has a hydrophilic (water-absorbent) skin-side layer and a non-skin-side layer including the non-skin-side waterproof region 3 in the thickness direction in the order closer to the skin of the wearer 10.

The non-skin side waterproof region 3 is formed by adhering a waterproofing agent to the non-skin facing surface 2b of the fiber sheet 2, and the fiber sheet 2 is inherently hydrophilic and has water absorption. .. Therefore, the non-adhering portion of the waterproofing agent in the fiber sheet 2 is hydrophilic and has water absorption. That is, the above-mentioned "the region 21 corresponding to the non-skin side waterproof region 3 on the skin facing surface 2a of the fiber sheet 2 is hydrophilic" means that the waterproofing agent is applied to the non-skin facing surface 2b of the fiber sheet 2. It means that the hydrophilicity (water absorption) of the region 21 on the back surface thereof is maintained after the non-skin side waterproof region 3 is formed by adhering. In FIG. 3, from the viewpoint of easy understanding, the non-skin side waterproof region 3 is described as being laminated on the non-skin facing surface 2b of the fiber sheet 2, but the actual state is not necessarily the same. Not at all.

In the waterproofing pants 5, the non-skin side waterproof region 3 functions as a body fluid barrier layer that prevents exudation of body fluids such as absorbed urine absorbed from the hydrophilic skin facing surface 2a of the fiber sheet 2. For example, as shown in FIG. 3, when the outer garment 20 is worn over the waterproof garment 5 as the inner garment, so-called "slight leakage" occurs, and about 1 mL or less from the excretory part (penis) of the wearer 10. When a small amount of urine is excreted, the excreted urine migrates from the skin-facing surface 2a of the fiber sheet 2 toward the non-skin-facing surface 2b to reach the outer garment 20 and reaches the outer garment 20 from the outside. There is concern that visible urine stains may occur. However, in the waterproofing pants 5, since the non-skin side waterproof region 3 is formed on the non-skin facing surface 2b of the fiber sheet 2, urine does not easily seep out from the non-skin side waterproof region 3, and the outer clothing 20 Prevents urine stains from occurring.
Further, in the waterproofing pants 5, although the non-skin side waterproof region 3 is formed on the non-skin facing surface 2b of the fiber sheet 2 constituting the pants 5, the region 21 on the back surface thereof is hydrophilic (fiber sheet 2). As is clear from the fact that the original hydrophilicity of the non-skin side is maintained), before the formation of the non-skin side waterproof region 3 (adhesion of the waterproofing agent) except that the non-skin side waterproof region 3 is formed. Since there is virtually no change from the state of (previous) except for the rigidity value described later, it can be used with the same feeling as wearing normal underwear. In other words, the basic performance such as the appearance, wearing feeling, and water absorption of the waterproof pants 5 is not inferior to that of its predecessor, the men's pants 1, and in some cases, it may be improved, and it is waterproof. The sex-imparting pants 5 are excellent not only in the effect of the non-skin side waterproof region 3 (effect of preventing urine stains), but also in texture and usability.

The formation position of the non-skin side waterproof region 3 is not particularly limited on the premise that it is the non-skin facing surface 2b of the fiber sheet 2, and is appropriately determined according to the type of the fiber article provided with the fiber sheet 2. Can be done. For example, when the textile article is men's pants such as waterproofing pants 5, the non-skin side waterproof area 3 is typically in the front body of the men's pants, as shown in FIGS. 2 and 3. It is formed on the part facing the wearer's excretory part (penis).

As described above, the non-skin side waterproof region 3 has a contact angle with water of 0 degrees or more and 70 degrees or less, preferably 5 degrees or more and 65 degrees or less, and more preferably 10 degrees or more and 60 degrees or less. The contact angle is an index of the hydrophobicity (hydrophilicity) of the non-skin side waterproof region 3, and the larger the value of the contact angle, the stronger the hydrophobicity (lower the hydrophilicity), and the numerical value of the contact angle. The smaller the value, the weaker the hydrophobicity (higher hydrophilicity). The contact angle is measured by the following <method for measuring the contact angle on the sheet surface>.

Conventionally, when waterproofing performance is imparted to a work piece (textile article), the hydrophobicity of the waterproofing performance imparting region (non-skin side waterproof region in the present invention) is when the contact angle with water is used as an index. Is generally in the range exceeding 90 degrees. On the other hand, in the technical idea of the present invention, the non-skin side waterproof region 3 prevents the liquid from transferring from the inner clothing (textile article) side such as underwear to the outer clothing side such as trousers, and the liquid is contained in the inner clothing. It is sufficient to be able to fasten the garment, and for that purpose, it is sufficient to impart the inner garment to a hydrophilicity (high hydrophobicity) sufficiently lower than the hydrophilicity of the outer garment. From such a viewpoint, in the present invention, the contact angle of the non-skin side waterproof region 3 with water is set to 0 degrees or more and 70 degrees or less.

On the other hand, the region 21 corresponding to the non-skin side waterproof region 3 on the skin facing surface 2a of the fiber sheet 2 is hydrophilic as described above, and in contrast to the non-skin facing surface 2b, there is no feeling of wetness and a comfortable feeling of use. It is not preferable that excessive waterproof performance is imparted in consideration of the fact that the above is required. From such a viewpoint, the contact angle of the region 21 with water is preferably 60 degrees or less, more preferably 40 degrees or less, and most preferably covered in the following <method for measuring the contact angle of the sheet surface>. When a droplet of ion-exchanged water is attached to the region 21 which is the measurement surface, the droplet is absorbed almost at the same time (instantaneously) as the droplet is attached. That is, it is most preferable that the region 21 has high hydrophilicity (water absorption) so that the contact angle cannot be measured using ion-exchanged water. The contact angle of the fiber sheet 2 on the skin-facing surface 2a other than the region 21 with water is typically the same as that of the region 21.

<Measuring method of contact angle on sheet surface>
From the fiber sheet (textile article) to be measured, a rectangular shape in a plan view having a length of 100 mm in the flow direction (MD) and a length of 100 mm in the direction orthogonal to the MD (CD) at the time of manufacturing the fiber sheet is cut out and measured. As a sample, let it stand in a predetermined measurement environment for one day and night and let it blend in. The measurement environment is an air temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5% RH. A droplet of ion-exchanged water is attached to the surface to be measured (the surface of the non-skin side waterproof region) of the contact angle in the measurement sample, the droplet is recorded, and the contact angle is measured based on the recorded image. More specifically, a contact angle meter DM300 manufactured by Kyowa Interface Science is used as the measuring device. The measurement sample is set on the measurement stage of the measurement device so that the surface to be measured faces upward and can be observed from the CD direction of the measurement sample. Then, a droplet of 3 μL of ion-exchanged water is attached to the surface to be measured of the measurement sample set on the measurement stage, and an image of the droplet is recorded and taken into the measuring device. At this time, as an image, an image one second after the droplet is attached to the measurement sample and the needle is separated from the droplet is used. From the plurality of recorded images, 10 images in which both ends or one end in the CD direction of the droplet are clear are selected, the contact angle of the droplet is measured based on the reference plane for each of the 10 images, and the contact between them is measured. The average value of the angles is taken as the contact angle of the surface to be measured (non-skin side waterproof area) to be measured.

In the above <method for measuring the contact angle of the sheet surface>, depending on the woven structure of the fabric in the measurement target (fiber sheet), the surface unevenness may be large and the reference surface may not be determined at the time of magnified observation. In that case, the amount of droplets of ion-exchanged water adhered was changed from the above 3 μL to 0.1 mL, and the method of adhering the droplets was static attachment using a Komagome pipette, and the image was not enlarged (1/1). take in. Except for the above points, the measurement can be performed in the same manner as described above.

The second feature of the waterproofing pants 5 is that the bending rigidity value of the fiber sheet 2 in the non-skin side waterproofing region 3 is 1.2 times or more 4 times that before the waterproofing agent is attached, that is, the men's pants 1. The point is that it is less than 0.0 times. That is, in the waterproof treatment method of the present invention and the manufacturing method of the present invention, the waterproofing agent is adhered to the fiber sheet 2 to improve the bending rigidity of the adhered portion.
As a result, the anxiety about the effectiveness of the adhesion work (effect of preventing urine stains) of the person who has performed the work of attaching the waterproofing agent (surface treatment process), typically the wearer of the waterproofing pants 5, can be removed. This makes it possible to use the waterproof pants 5 with peace of mind. To further explain the effect of the present invention, the non-skin side waterproof region 3 is usually indistinguishable from the surrounding non-adherent portion of the waterproofing agent, so that the wearer of the waterproofing pants 5 can use it. There is concern about the effectiveness of the area 3. On the other hand, in the present invention, as described above, the bending rigidity of the fiber sheet 2 at the adhering portion is improved due to the adhesion of the waterproofing agent, and typically, the waterproofing agent is attached. Since the touch is changed as compared with the front or the non-adhered portion of the waterproofing agent, it is easy for the wearer to recognize that the non-skin side waterproof region 3 is formed, and the above concern is dispelled. Eliminating the anxiety about the effectiveness of the surface treatment process in this way leads to an improvement in the sense of security in using the waterproofing fiber article, and is driven by such anxiety to excessively use the waterproofing agent. This also leads to the suppression of this, and the amount of waterproofing agent used can be saved compared to the conventional method. The flexural rigidity value is measured by the following method. The larger the flexural rigidity value, the higher the rigidity of the fiber sheet, and therefore, the tactile sensation differs between the adhered portion and the non-adhered portion of the waterproofing agent.

<Measurement method of flexural rigidity value>
For the measurement, a texture tester HOM-3 manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd., which conforms to the rigidity measurement method specified in JIS L1096 (general textile test method), is used. From the fiber sheet (fiber article) to be measured, a square shape in a plan view having an MD length of 10 cm and a CD length of 10 cm at the time of manufacturing the fiber sheet is cut out and used as a measurement sample. The distance between the slots on the sample table provided in the tester is adjusted to 15 mm, and the measurement sample is arranged so that the center of the measurement sample is located at the center position between the slots and the measurement sample is horizontal. At this time, the blade provided in the tester faces the surface of the measurement sample opposite to the adhesion portion (non-skin side waterproof area) of the waterproofing agent (if the measurement sample is of the present invention, the fiber sheet faces the skin). The measurement sample is placed between the slots so that it is in contact with the surface) and the longitudinal direction of the blade is parallel to the CD of the measurement sample (the direction of 15 mm between the slots coincides with the MD direction of the measurement sample). An indicator when the blade adjusted to descend 6 mm below the top surface of the sample table (bottom position) is lowered from above the measurement sample at a constant speed of 3 mm / sec and the measurement sample is pressed by the blade. Read the maximum value (cN) indicated by (load meter). Such measurement is performed 5 times, and the average value thereof is calculated and used as the flexural rigidity value of the measurement sample. The measurement is carried out at a temperature of 23 ± 2 ° C. and a relative humidity of 50% RH ± 5%.

The flexural rigidity value of the fiber sheet 2 in the non-skin side waterproof region 3 is 1.2 times or more and 4.0 times or less, preferably 1.3 times or more, as described above, as compared with that before the waterproofing agent was attached. It is 3.8 times or less, more preferably 1.4 times or more and 3.6 times or less. If the ratio is less than 1.2 times, it becomes difficult to recognize the change in the rigidity of the fiber sheet 2, and if it exceeds 4.0 times, the wearing feeling of the fiber sheet 2 may be deteriorated.
The flexural rigidity value of the fiber sheet 2 in the non-skin side waterproof region 3 in the waterproofing pants 5, that is, the flexural rigidity value of the fiber sheet after the surface treatment step according to the present invention is 11 cN or more, preferably 12 cN or more, more preferably. It is 13 cN or more and 40 cN or less, preferably 38 cN or less, more preferably 36 cN or less.

The flexural rigidity value of the fiber sheet after the surface treatment step can be adjusted by appropriately adjusting the amount of the waterproofing agent adhering to the fiber sheet, the type of the waterproofing agent to be used, and the like.
In the surface treatment step according to the present invention, the amount of the waterproofing agent adhering to the fiber sheet is preferably 1 g / m ² or more, more preferably 2 g / m ² or more, still more preferably 3 g / m ² or more as a solid content. And, preferably 20 g / m ² or less, more preferably 18 g / m ² or less, still more preferably 16 g / m ² or less. In general, the larger the amount of the waterproofing agent attached, the harder the fiber sheet tends to be and the more stiff it feels.

Further explaining the waterproofing agent used in the present invention, the contact angle of the waterproofing agent with water is preferably 60 degrees or more and 90 degrees or less, more preferably 62 degrees or more and 88 degrees or less, and further preferably 65 degrees or more. It is 85 degrees or less. The contact angle is an index of the hydrophobicity (hydrophilicity) of the waterproof component (polymer) contained in the waterproofing agent, more specifically, the waterproofing agent, and the larger the value of the contact angle, the more. , The waterproofing agent has strong hydrophobicity (low hydrophilicity), and the smaller the value of the contact angle, the weaker the hydrophobicity (higher hydrophilicity). When the contact angle of the waterproofing agent used for forming the non-skin side waterproofing region 3 with water is within the above range, the first and second features described above are more reliably imparted to the waterproofing fiber article. The predetermined effect of the present invention (the inconvenience that the body fluid excreted from the body exudes into the clothes and becomes visible from the outside is prevented, and the user is not worried about its effectiveness). It will be played more reliably. The contact angle is measured by the following <method for measuring the contact angle of the waterproofing agent>.

<Measuring method of contact angle of waterproofing agent>
The waterproofing agent to be measured is poured onto a vat, and the vat is allowed to stand in an environment having an atmospheric temperature of 25 ° C. for 12 hours to form a film of the waterproofing agent. This membrane is used as a measurement sample. The measurement environment is an air temperature of 23 ± 2 ° C. and a relative humidity of 50 ± 5% RH. A droplet of 1 μL of ion-exchanged water is attached to the surface to be measured for the contact angle in the measurement sample, the droplet is recorded, and the contact angle is measured based on the recorded image. As a measuring device, for example, a microscope VHX-1000 manufactured by KEYENCE CORPORATION is used. From the plurality of recorded images, 10 images with a clear outline of the droplet are selected, the contact angle of the droplet is measured based on the reference plane for each of the 10 images, and the average value of the contact angles is calculated. , The contact angle of the waterproofing agent.

The waterproofing agent typically contains a polymer as at least a waterproofing component. The content of the polymer in the waterproofing agent is preferably 3% by mass or more, more preferably 4% by mass, based on the total mass of the waterproofing agent from the viewpoint of improving the waterproofness of the article made of waterproofing fiber. % Or more, more preferably 4.5% by mass or more.
The content of the polymer in the waterproofing agent is determined from the viewpoint of the treatment efficiency of the waterproofing agent and the ease of spraying when the spray coating method is applied as the method of adhering the waterproofing agent to the fiber sheet. Therefore, it is preferably 15% by mass or less, more preferably 10% by mass or less, still more preferably 7% by mass or less, based on the total mass of the waterproofing agent.
The content of the above-mentioned polymer is the content of the polymer when the waterproofing agent contains only one kind of polymer, and when the waterproofing agent contains two or more kinds of polymers, the total content of all the polymers is contained. It is a quantity.

From the viewpoint of ensuring that the waterproofing agent has a more reliable effect of preventing urine stains, the polymer contained in the waterproofing agent preferably has a solubility in water at a liquid temperature of 25 ° C. as measured by the following method. It is less than 50 mg / 100 g, more preferably 40 mg / 100 g or less, still more preferably 30 mg / 100 g or less, still more preferably 20 mg / 100 g or less, still more preferably less than 20 mg / 100 g.

<Measurement method of polymer solubility in water>
Add 500 g of water to a 1 L glass beaker, use a rotor (made of fluororesin (PTFE), φ8 mm × 50 mm), and keep the temperature in a constant temperature bath at 25 ° C. while stirring at a rotation speed of 100 rpm. 0.1 g of the polymer to be measured is added to the water having a liquid temperature of 25 ° C., and after 10 minutes, it is visually confirmed whether or not the polymer is in a uniform and transparent state. Add 0.1 g of additional polymer until it is no longer uniform and transparent, and measure its solubility in water. If the polymer is solid, it is dissolved in the form of a powder under 16 mesh. As the water used in this measurement method, for example, "pure water having a conductivity of 1 μS / cm or less at 25 ° C. produced by a pure water device" G-10DSTSET "manufactured by Organo Corporation" can be used.
If 50 g of the polymer is uniformly transparent even after adding 50 g of the polymer, the measurement is terminated at that point, and it is judged that the solubility in water at a liquid temperature of 25 ° C. is 10 g / 100 g or more. If 0.1 g of the polymer is not uniformly transparent, the solubility in water at a liquid temperature of 25 ° C. is judged to be less than 20 mg / 100 g.

Examples of the polymer (waterproof component) contained in the waterproofing agent include an acrylic polymer, a fluorine-based polymer, and a silicone-based polymer. The waterproofing agent may contain one kind of polymer or two or more kinds of polymers.

As the acrylic polymer that can be contained in the waterproofing agent, for example, an acrylic acid derivative such as acrylonitrile, methacrylic acid, acrylic acid, methacrylic acid, acrylic acid ester, or methacrylic acid ester is used alone or copolymerized as a main component. You can use what you get. Specifically, (acrylic acid / acrylamide) copolymer such as (acrylic acid / t-butyl acrylamide) copolymer, (acrylic acid / acrylamide / ethyl) such as (acrylic acid / acrylamide / ethyl acrylate) copolymer and the like. Acrylic acid alkyl ester) copolymer, (alkylacrylamide / acrylic acid / alkylaminoalkylacrylamide / polyethylene glycol methacrylate) copolymer, acrylic acid alkyl ester polymer, methacrylic acid alkyl ester polymer, (acrylic acid / acrylic acid) Alkyl ester) copolymer, (acrylic acid / alkyl methacrylate ester) copolymer, (methacrylic acid / alkyl methacrylate ester) copolymer, (acrylic acid / alkyl methacrylate ester) copolymer, alkyl acrylic acid (Ester / t-butyl acrylamide) copolymer, (acrylic acid alkyl ester / acrylamide) copolymer such as (acrylic acid alkyl ester / octyl acrylamide) copolymer, (acrylic acid / acrylic acid alkyl ester / t-butyl acrylamide) ) Copolymers such as (acrylic acid / alkyl acrylate / alkyl acrylamide) copolymers, (methacrylic acid / alkyl acrylate / alkyl acrylamide) copolymers, (methacryloyloxyethyl carboxybetaine / alkyl methacrylate) Copolymers, (alkylacrylamide / alkylaminoalkylacrylamide / polyethylene glycol methacrylate) copolymers, (octylacrylamide / hydroxypropyl acrylate / butylaminoethyl methacrylate) copolymers, (alkylacrylamide / alkyl acrylate / alkyl Aminoalkylacrylamide / polyethylene glycol methacrylate) copolymer, (acrylic acid alkyl ester / diacetoneacrylamide) copolymer, (styrene / acrylic acid) copolymer, (styrene / acrylic acid alkyl ester) copolymer, (styrene) / Acrylamide) copolymer, urethane-acrylic copolymer, (vinylpyrrolidone / acrylic acid / methacrylic acid) copolymer, (vinylpyrrolidone / acrylic acid alkyl ester / methacrylic acid) copolymer, (octylacrylamide / acrylic) Hydroxypropyl Acidate / Butylaminoethyl Methacrylate) Copolymer, (methacryloyloxyethyl carboxybetaine / meta Crylic acid alkyl ester) copolymer, (acrylic acid / acrylic acid alkyl ester / methacrylic acid ethylamine oxide) copolymer and the like can be mentioned.

Examples of the fluorine-based polymer that can be contained in the waterproofing agent include polymers of fluorinated olefins such as polytetrafluoroethylene and polyvinylidene fluoride; those obtained by modifying a part of the polymer.

Examples of the silicone-based polymer that can be contained in the waterproofing agent include silicone resin, (acrylic acid / dimethicone) copolymer, and silicone graft copolymer. In particular, a silicone graft copolymer having a polysiloxane skeleton as a main chain is preferable as the polymer. The polysiloxane skeleton has a structure composed of an —O—Si—O—Si− bond, and silicone is typically used. As the silicone, it is preferable to use various modified silicones from the viewpoint of imparting waterproofness. Examples of the modified silicone include, but are not limited to, fatty acid-modified silicone and acrylic silicone.

Examples of the polymer (waterproof component) contained in the waterproofing agent include, for example, vinyl methyl ether / maleic acid) copolymers and (vinyl methyl ether / vinyl methyl ether /), in addition to the above-mentioned acrylic polymers, fluorine-based polymers and silicone-based polymers. Maleic acid-based polymers such as a maleic acid alkyl ester) copolymer and a (vinyl methyl ether / butyl maleate) copolymer can also be used.

A preferable example of the polymer contained in the waterproofing agent is an acrylic polymer. In particular, an acrylic polymer having a solubility in water at a liquid temperature of 25 ° C. within the above range is preferable. Further, the waterproofing agent containing an acrylic polymer preferably has a contact angle with water within the above range.

In the present invention, the waterproofing agent may be a liquid (fluid) or a solid. When the waterproofing agent is a liquid, it preferably contains a volatile solvent as one of its constituent components. The volatile solvent is preferably a substance having a saturated vapor pressure of 3000 Pa or more at a liquid temperature of 25 ° C. of the solvent. Examples of the volatile solvent include water and an organic solvent. A mixed solvent of water and a water-soluble organic solvent may be used as the volatile solvent. Examples of volatile solvents composed of organic solvents include alcohols, esters, nitriles, ethers, hydrocarbons, ketones, amines, acetic acid and the like. One of these volatile solvents can be used alone, or two or more of these volatile solvents can be used in combination. When two or more kinds of volatile solvents are used in combination, the saturated vapor pressure is the saturated vapor pressure of the volatile solvent having the lowest saturated vapor pressure among the plurality of volatile solvents used. Of these volatile solvents, water and alcohol are preferable, and one or more selected from the group consisting of water, ethanol, and propanol from the viewpoint of achieving both the solubility of the polymer and the drying time of the waterproofing agent. It is more preferable to use the combination of.

When alcohol is used as the volatile solvent, it is preferable to use a monohydric or polyhydric aliphatic alcohol having 1 or more and 5 or less carbon atoms, and a monohydric alcohol having 2 or more and 4 or less carbon atoms, for example. , Ethanol, propanol, butanol and the like are more preferable. When an ester is used as the volatile solvent, an ester of a monovalent or polyvalent fatty alcohol having 1 or more and 4 or less carbon atoms and a monovalent or polyvalent fatty acid having 1 or more and 4 or less carbon atoms. Is preferable, and esters of a monovalent fatty alcohol having 1 or more and 2 or less carbon atoms and a monovalent fatty acid having 1 or more and 4 or less carbon atoms, such as ethyl acetate, methyl propionate and butyl acetate. It is more preferable to use. When nitrile is used as the volatile solvent, it is preferable to use nitrile of an alkane having 2 or more and 3 or less carbon atoms, for example, acetonitrile. Further, from the viewpoint of preventing ignition and ignition, it is preferable to use water in combination with another volatile solvent, and it is preferable that 5 parts by mass or more of water is contained in a total of 100 parts by mass of the volatile solvent, and 10 parts by mass. It is more preferably contained in an amount of 50 parts by mass or less, and more preferably 20 parts by mass or less from the viewpoint of shortening the drying time of the waterproofing agent.

When the waterproofing agent contains the above-mentioned polymer (waterproofing component) and a volatile solvent as its constituent components, the polymer has a solubility in 100 g of the volatile solvent of 1 g or more at 25 ° C. Is preferable. That is, the solubility of the polymer in a volatile solvent at a liquid temperature of 25 ° C. is preferably 1 g or more. The solubility of the polymer in this volatile solvent can be measured according to the above-mentioned <Method for measuring the solubility of the polymer in water>.
As long as the effects of the present invention are not impaired, it is permissible for the waterproofing agent to contain a polymer insoluble in the above-mentioned volatile solvent. However, it is preferable that the waterproofing agent contains only a polymer that is soluble in the above-mentioned volatile solvent from the viewpoint that the effect of the present invention is surely exhibited. The volatile solvent serves as a medium capable of dissolving the component contained in the waterproofing agent, and the content of the volatile solvent in the waterproofing agent can be the balance of the component.

The waterproofing agent may contain components other than the above-mentioned polymer and volatile solvent. Such other components include, for example, deodorants, antibacterial agents, and fragrances for the purpose of reducing urine odor; easy removal of the waterproofing agent (non-skin side waterproofing area) by washing the waterproofing fiber article. Surfactants or plasticizers for the purpose of improving the properties; water absorbents for the purpose of improving the quick-drying property of the excreted body fluid; dyes or pigments for the purpose of improving the visibility of the non-skin side waterproof area. These other components are contained in the waterproofing agent in a total amount of preferably 5% by mass or less. From the viewpoint of further enhancing the effect of the invention, it is preferable that the waterproofing agent contains only the above-mentioned polymer and volatile solvent.

From the viewpoint of mist uniformity when the waterproofing agent is spray-coated, the viscosity of the waterproofing agent is preferably 20 mPa · s or less, more preferably 15 mPa · s or less, still more preferably 10 mPa · s at 25 ° C. It is as follows. The lower limit of the viscosity is not particularly limited, and the lower the viscosity, the more preferable. However, if the viscosity is as low as about 5 mPa · s, the effect of the present invention is sufficiently exhibited. The viscosity of the waterproofing agent is measured using a B-type viscometer. As the B-type viscometer, for example, a B-type viscometer manufactured by Tokyo Keiki Co., Ltd. can be used. The measurement conditions are Spindle No. M1 and the number of revolutions are appropriately selected according to the viscosity.

In the waterproof treatment method and the manufacturing method of the present invention, the method of adhering the waterproofing agent to the fiber sheet is not particularly limited, and a known method can be appropriately selected depending on the dosage form of the waterproofing agent. When the waterproofing agent is a liquid (fluid), for example, in addition to the spray coating as shown in FIG. 1, various printing methods (transfer, die coating, gravure coating, inkjet method, screen printing method, etc.) , Immersion of the fiber sheet in the waterproofing agent-containing liquid. When the waterproofing agent is solid, for example, a method in which the waterproofing agent solidified in a stick shape is brought into direct contact with the textile article to apply the waterproofing agent, or a textile article using a sponge or the like. There is a method of indirectly applying to. Further, the means for attaching the waterproofing agent may be a contact type that comes into contact with the textile article when the agent is attached, or a non-contact type that does not come into contact with the textile article when the agent is attached.

As a method of adhering the waterproofing agent to the fiber sheet, a spray coating method is particularly preferable. The spray coating method has an advantage that a desired state can be efficiently formed by appropriately adjusting various physical properties such as the viscosity of the waterproofing agent, the shape of the spray nozzle, and the coating amount thereof. In particular, a method of attaching the waterproofing agent using an aerosol sprayer, a manual trigger sprayer, ultrasonic waves, or the like is more preferable because the user can easily form the waterproof layer.

As one of the means for adhering the waterproofing agent that can be used in the present invention, there is a pump spray type agent adhering means in which a container provided with a sprayer is filled with the waterproofing agent. That is, in the waterproof treatment method and the manufacturing method of the present invention, the waterproofing agent can be attached to the fiber sheet by spraying the waterproofing agent by the pump spray type agent attaching means. In the present invention, conventionally known pump spray type agent adhering means can be used without particular limitation.

Further, as another means for adhering the waterproofing agent that can be used in the present invention, there is an aerosol spray type agent adhering means in which the pressure resistant container for aerosol spray is filled with the waterproofing agent and the propellant. .. That is, in the waterproof treatment method and the manufacturing method of the present invention, the aerosol spray type agent adhering means for adhering the waterproofing agent to the fiber sheet is formed by filling the pressure resistant container for aerosol spray with the waterproofing agent and the propellant. It can be carried out by spraying a waterproofing agent. In the present invention, conventionally known aerosol spray type agent adhering means can be used without particular limitation. Examples of the propellant include those using a compressed gas such as nitrogen gas and carbon dioxide gas, and those using a liquefied gas such as liquefied petroleum gas (LPG) and dimethyl ether (DME).

Further, as another means for adhering the waterproofing agent that can be used in the present invention, there is a manual spray type agent adhering means in which a container provided with a manual sprayer is filled with the waterproofing agent. Be done. That is, in the waterproof treatment method and the manufacturing method of the present invention, the waterproofing agent is attached to the fiber sheet by manually spraying the waterproofing agent in a container provided with a manual sprayer. It can be carried out by spraying a waterproofing agent by means. This manual spray type agent adhering means is a sprayer that does not use a propellant such as gas. Specific examples thereof include a manual trigger sprayer and an ultrasonic type, and in particular, an accumulator type manual spray. The formula agent adhering means is preferably used in the present invention because it has good mist particle size, mist diameter uniformity, and the like. Further, as an example of the method of using the manual spray type agent adhering means, a method of spraying with compressed air or the like by a container provided with the compression means can also be used.

Further, as still one of the means for adhering the waterproofing agent that can be used in the present invention, it is composed of a stick-shaped solid material of the waterproofing agent, and the solid material is brought into contact with the treatment target. Examples thereof include those in which a waterproofing agent can be applied to the treatment target. That is, in the waterproof treatment method and the manufacturing method of the present invention, the waterproofing agent is adhered to the fiber sheet by using an agent adhering means composed of a stick-shaped solid material, and the solid material is brought into contact with the treatment target. It can be carried out by. The agent adhering means containing the stick-shaped solid material is configured in the same manner as, for example, lipstick, stick glue, etc., and includes a stick-shaped solid material as a waterproofing agent and a support portion for supporting the solid material.

Further, as yet another means for adhering the waterproofing agent that can be used in the present invention, there is a roll-on type agent adhering means in which the roll-on container is filled with the waterproofing agent. That is, in the waterproof treatment method and the manufacturing method of the present invention, the waterproofing agent is attached to the textile article by the roll-on type agent attaching means, which comprises filling the roll-on container with the waterproofing agent. it can. The roll-on container is a container in which an inner plug that holds the ball rotatably is arranged at the container mouth, and the content (waterproofing agent) is distributed on the surface of the ball and applied to a desired portion. When using a roll-on container, the ball is brought into contact with the non-skin facing surface of the textile article to which the contents are attached, the container body is lifted upward, the contents are brought into contact with the ball, and the ball is moved. By rolling on the non-skin facing surface, the contents are distributed to the surface of the ball. As the roll-on container, a known one can be used without particular limitation.

In the waterproof treatment method and the manufacturing method of the present invention, the adhesion pattern of the waterproofing agent in the non-skin side waterproof area is not particularly limited, and the waterproofing agent is continuously present in the entire area of the non-skin side waterproof area without any gap. A pattern (so-called solid coating) may be used, but from the viewpoint of ensuring the breathability and flexibility of the fiber sheet, a pattern in which a waterproofing agent adhering portion and a non-adhering portion are mixed in the non-skin side waterproof region is preferable. From the viewpoint of mixing the adhering portion and the non-adhering portion of the waterproofing agent in the non-skin side waterproof region, the spray coating method as shown in FIG. 1 is preferable as the method of adhering the waterproofing agent to the fiber sheet.

When the adhering part and the non-adhering part of the waterproofing agent are mixed with a certain degree of cohesion, the virtual line connecting the adhering part located on the outermost side in the cohesive part is the outer edge of the non-skin side waterproof area. is there. Therefore, when measuring the above-mentioned "flexural rigidity value of the fiber sheet in the non-skin side waterproof area", the bending of the fiber sheet in the area surrounded by the "outer edge of the non-skin side waterproof area" determined in this way. The rigidity value may be measured by the above method.

In the waterproof treatment method and the manufacturing method of the present invention, the waterproofing agent is not typically adhered to the skin-facing surface of the fiber sheet, but the waterproofing fiber articles obtained by both methods are described in the first and the above. A waterproofing agent may be attached to the skin-facing surface of the fiber sheet on the premise that it has the second feature.

In the waterproof treatment method and the manufacturing method of the present invention, the fiber sheet may be dried after the waterproofing agent is attached to the fiber sheet. The method for drying the fiber sheet is not particularly limited, and examples thereof include drying by heating, drying by reduced pressure, forced drying by combining heating and reduced pressure, and natural drying.

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

(Waterproofing agent A)
An acrylic polymer (ES-435, manufactured by International Specialty Products) was used as a waterproofing agent, which was dissolved in an ethanol solvent at room temperature to prepare a 5% by mass ethanol solution, and further sprayed with dimethyl ether / LPG (70/30) gas. It was sealed in a can (ethanol solution / gas weight ratio = 40/60) to obtain a waterproofing agent A as a spray agent.

(Waterproofing agent B)
An acrylic polymer (Mitsushishi Petrochemical Company, R205) was used as a waterproofing agent, which was dissolved in an ethanol solvent at room temperature to prepare a 5% by mass ethanol solution, and further in a spray can together with dimethyl ether / LPG (70/30) gas. It was sealed (ethanol solution / gas weight ratio = 40/60) to obtain a waterproofing agent B as a spray agent.

(Waterproofing agent C)
An acrylic polymer (Amphomer 28-4910, manufactured by NSC Co., Ltd.) was used as a waterproofing agent, which was dissolved in an ethanol solvent at room temperature to prepare a 5% by mass ethanol solution, and further dimethyl ether / LPG (70/30) gas. (Ethanol solution / gas weight ratio = 40/60) was sealed in a spray can to obtain a waterproofing agent C as a spray agent.

(Waterproofing agent D)
A silicone polymer (OS-88, manufactured by Kao Co., Ltd.) is used as a waterproofing agent, which is dissolved in an ethanol solvent at room temperature to prepare a 5% by mass ethanol solution, and further sprayed with dimethyl ether / LPG (70/30) gas. It was sealed in a can (ethanol solution / gas weight ratio = 40/60) to obtain a waterproofing agent D as a spray agent.

(Fiber sheet: pre-treated cotton cloth)
Prepare a raw cloth with a width of 60 cm, a length of 1 m, and a basis weight of 180 g / m ² (Oxford plain white cotton cloth, product number 20122000003154, purchased at Yuzawaya) for the purpose of eliminating the influence of process oils on the raw cloth. Pretreatment was performed. Specifically, the raw cloth is washed and rinsed, dried in a 23 ± 2 ° C./50 ± 5% RH environment for one day and night, and then ironed at a high temperature using an iron (manufactured by Panasonic, NI-S33). Wrinkles were removed by hanging. For washing and rinsing operation, use a commercially available washing machine (Hitachi, NW-500MX) and a commercially available detergent (Kao Corporation, Ultra Attack Neo) with a water volume of 30 L, "washing 4 minutes → rinsing once → It was carried out in the process of "dehydration 5 minutes". The pretreated cotton cloth thus obtained was used as a textile article. This textile article has a water absorption time of 30 seconds or less according to the dropping method of JIS L-1907.

[Examples 1 to 3 and Comparative Examples 1 to 2]
One of the waterproofing agents A to D is filled in a bottle of a manual sprayer, and the contents of the spray-type discharge container are applied to one surface of the pretreated cotton cloth as a fiber sheet. A certain waterproofing agent was sprayed and adhered to obtain a waterproofing fiber article (surface treatment step). More specifically, the pretreated cotton cloth is placed on the filter paper with one side facing upward, and the entire surface of the pretreated cotton cloth is covered from a position 10 cm above the pretreated cotton cloth. On the other hand, the contents of the spray-type discharge container were sprayed and adhered. As the manual sprayer, a product number Z-155-C110-1-290 (95-0) (opening diameter 0.45 mm, discharge rate 0.15 mL per operation) manufactured by Mitani Valve Co., Ltd. was used. Performance evaluation was performed 10 minutes after the contents were attached.

[Performance evaluation]
The surface-treated / untreated discriminating property, feel, and liquid barrier property of each of the waterproof-imparted fiber articles of Examples and Comparative Examples were evaluated by the following methods. The results are shown in Table 1 below.
As a reference example, Table 1 below also shows the evaluation results of the pre-treated cotton cloth which was not subjected to the surface treatment step.
The "flexural rigidity value before the surface treatment process of the fiber sheet" in "flexural rigidity value after the surface treatment process of the fiber sheet / flexural rigidity value before the surface treatment process of the fiber sheet" in Table 1 below is a reference example. This is the flexural rigidity value of the product that was not subjected to the surface treatment step.

<Evaluation method of surface treatment / untreated distinctiveness>
Five specialized panelists were asked to touch the entire 100 mm × 100 mm square-shaped test object in a plan view with their fingers, and the feel at that time was evaluated according to the following evaluation criteria. Then, the case where the total evaluation points of the five persons was 13 points or more was evaluated as 〇, the case of 8 points or more and 12 points or less was evaluated as Δ, and the case of 7 points or less was evaluated as ×.
(Evaluation criteria for feel)
1 point: Equivalent to untreated cloth, 2 points: Slight difference can be seen, 3 points: Difference can be seen

<Evaluation method of feel>
Five specialized panelists were asked to touch the entire 100 mm × 100 mm square-shaped test object in a plan view with their fingers, and the feel at that time was evaluated according to the following evaluation criteria. Then, the case where the total evaluation points of the five persons was 13 points or more was evaluated as 〇, the case of 8 points or more and 12 points or less was evaluated as Δ, and the case of 7 points or less was evaluated as ×.
(Evaluation criteria for feel)
1 point: bad, 2 points: slightly bad, 3 points: equivalent to untreated cloth, 4 points: slightly good, 5 points: good

<Evaluation method of liquid barrier property>
The filter paper and the water-permeable sheet are placed on a horizontal table in this order, and left in an environment with a temperature of 25 ° C. for 2 hours. As the water-permeable sheet, a fiber sheet to which the waterproofing agent is not attached, that is, the pretreated cotton cloth (reference example) is used. Next, the waterproofing fiber article to be evaluated is placed on the upper surface of the water permeable sheet. At that time, if the evaluation target has a waterproofing agent attached to one side, the evaluation target is set to the water permeable sheet so that the surface to which the waterproofing agent adheres faces the upper surface of the water permeable sheet. Layer on top. Then, 1 mL of blue water is dropped onto the upper surface of the evaluation target with a dropper. This blue water is distilled water colored with a colorant (Blue No. 1) (colorant concentration 0.1% by mass). After 5 minutes from the dropping of blue water, the evaluation target is removed, and the remaining undercloth and filter paper are visually observed and evaluated according to the following evaluation criteria. In this test, the evaluation target is inner clothing such as underwear, and the water permeable sheet is outer clothing, and the difficulty of seeping liquid (blue water) from the evaluation target side to the water permeable sheet side (liquid barrier property) is evaluated. is there.
(Evaluation criteria for liquid barrier properties)
⊚: There is no adhesion part of blue water on both the permeable sheet and the filter paper.
〇: The water-permeable sheet has a blue water adhering portion having a maximum delivery length of 5 mm or less, but the filter paper does not have a blue water adhering portion.
Δ: The water-permeable sheet has a relatively large attachment portion of blue water (so-called stain) having a maximum delivery length of more than 20 mm, but the filter paper does not have an adhesion portion of blue water.
X: Adhesion of blue water of at least 2 mm or more is observed on the filter paper. Alternatively, the water-permeable sheet has a relatively large adhesion portion (so-called stain) of blue water having a maximum delivery length of more than 40 mm, and the filter paper has blue water adhesion.

1 Men's pants (textile goods)
2 Fiber sheet 2a Skin facing surface of fiber sheet 2b Non-skin facing surface of fiber sheet 3 Non-skin side waterproof area 4 Spray discharge container 5 Waterproofing pants (article made of waterproofing fiber)
10 Wearer 20 Outerwear

Claims (4)

A waterproof treatment method for waterproofing the fiber sheet of a textile article provided with a hydrophilic fiber sheet that can come into contact with the user's skin during use.
It has a surface treatment step of adhering a waterproofing agent to the non-skin facing surface of the fiber sheet.
By the surface treatment step, a non-skin side waterproof region having a contact angle with water of 0 degrees or more and 70 degrees or less is formed on the non-skin facing surface of the fiber sheet, and the non-skin side waterproofing on the skin facing surface of the fiber sheet. The hydrophilicity of the region corresponding to the region is maintained, and the bending rigidity value of the fiber sheet in the non-skin side waterproof region is 1.2 times or more and 4.0 times or less as compared with that before the waterproofing agent was attached. A method of waterproofing textile articles. The method for waterproofing a textile article according to claim 1, wherein the contact angle of the waterproofing agent with water is 60 degrees or more and 90 degrees or less. The method for waterproofing a textile article according to claim 1 or 2, wherein the waterproofing agent contains an acrylic polymer. It is a method of manufacturing waterproofing fiber articles.
It has a surface treatment step of attaching a waterproofing agent to the non-skin facing surface of the fiber sheet of a textile article provided with a hydrophilic fiber sheet that can come into contact with the user's skin during use.
By the surface treatment step, a non-skin side waterproof region having a contact angle with water of 0 degrees or more and 70 degrees or less is formed on the non-skin facing surface of the fiber sheet, and the non-skin side waterproofing on the skin facing surface of the fiber sheet. The hydrophilicity of the region corresponding to the region is maintained, and the bending rigidity value of the fiber sheet in the non-skin side waterproof region is 1.2 times or more and 4.0 times or less as compared with that before the waterproofing agent was attached. A method of manufacturing a waterproofing fiber article.

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