JP2019085680A - Water-absorptive fabric - Google Patents

Abstract

To provide a water-absorptive fabric having excellent water-absorptive diffusibility and dryness and capable of suppressing reduction of water-absorptive diffusibility and dryness even when repeatedly washed.SOLUTION: A fabric containing a polyester-based fabric having a vinyl polymer by polymerizing a vinyl compound represented by the formula (1) attached to a surface has excellent water-absorptive diffusibility and dryness, and further can suppress reduction of water-absorptive diffusibility and dryness even when repeatedly washed. There is provided a water absorptive fabric using a polyester fiber containing a single fiber with a flat cross section as the polyester fiber for a fabric base arranged in an opposite side to a skin side, and a polyester fiber containing a single fiber with a circular cross section for a fabric base arranged in the skin side. CH=C(R)-COO-(RO)-OC(R)=CH(1), where Rand Rare each independently H or methyl; Ris a C2 to 5 alkylene group; and n is an integer of 20 to 30.SELECTED DRAWING: None

Description

  The present invention relates to a water-absorbent woven or knitted fabric having excellent water absorption and diffusibility and drying properties, and capable of suppressing deterioration in water absorption and diffusivity and drying properties even after repeated washing.

  Sports and knits and shirts, such as innerwear, are required to be excellent in dryness because they have problems such as coldness and discomfort when they get wet, in addition to quickly absorbing perspiration.

  Heretofore, as a method of making the fabric have water absorbency, a method of putting a water absorbing agent into a dyeing bath and adsorbing the fabric by exhaust processing, a method of performing water absorption processing by padding, etc. are known. However, in these methods, the water absorption performance was inferior each time the laundry was performed, and the durability was poor.

  Further, Patent Document 1 is a fabric including polyester fibers processed by polymerizing a hydrophilic compound on the surface of the fiber, and the fabric having predetermined heat absorption characteristics and moisture absorption and cooling characteristics is excellent. It is disclosed that it may be hygroscopic and moisture releasing. However, in the fabric in which the hydrophilic compound disclosed in Patent Document 1 is polymerized on the fiber surface, the water absorption and diffusion (the property that the absorbed water spreads in the fabric), the drying property (the absorbed water is volatilized, and the fabric is dried) In terms of properties) and durability, there is still a lack of satisfaction and there is room for further improvement.

Unexamined-Japanese-Patent No. 2002-88653

  An object of the present invention is to provide a water-absorbent woven or knitted fabric which has excellent water absorption and diffusibility and drying properties, and is capable of suppressing a decrease in water absorption and diffusivity and drying even after repeated washing.

  The inventors of the present invention conducted intensive studies to solve the above problems, and as a result, a knitted fabric containing polyester fibers on the surface of which a vinyl polymer obtained by polymerizing a specific vinyl compound represented by the general formula (1) is attached. It has been found that it has excellent water absorption and diffusion properties and drying properties, and furthermore, it is possible to suppress the decrease in water absorption and diffusion properties and drying properties even after repeated washing. The present invention has been completed by further investigation based on these findings.

［一般式（１）中、Ｒ¹及びＲ²は同一又は異なって水素原子又はメチル基を示し、Ｒ³は炭素数２〜５のアルキレン基を示し、ｎは２０〜３０の整数を示す。］
項２． 前記ポリエステル繊維として、扁平断面の単繊維を含むポリエステル系繊維と、円形断面の単繊維を含むポリエステル系繊維とを含む、項１に記載の吸水性編物。
項３． 前記扁平断面の単繊維を含むポリエステル系繊維が肌側に配される編地に使用され、且つ前記円形断面の単繊維を含むポリエステル系繊維が肌側とは反対側に配される編地に使用されている、項２に記載の吸水性編物。
項４． １インチ間のウェール数と１インチ間のコース数とを掛け合わせて得られた値が１０００以上である、項１〜３のいずれかに記載の吸水性編物。
項５． 編組織がワッフル組織である、項１〜４のいずれかに記載の吸水性編物。 That is, the present invention provides the invention of the aspects listed below.
Item 1. A water-absorbent knit comprising a polyester-based fiber to which a vinyl-based polymer obtained by polymerizing a vinyl-based compound represented by the following general formula (1) is attached to the surface.

[In the general formula (1), R ¹ and R ² are the same or different and each represents a hydrogen atom or a methyl group, R ³ represents an alkylene group having 2 to 5 carbon atoms, n is an integer of 20-30. ]
Item 2. The water-absorbent knit according to item 1, comprising, as the polyester fibers, polyester-based fibers containing single fibers of flat cross section and polyester-based fibers containing single fibers of circular cross section.
Item 3. In a knitted fabric in which a polyester-based fiber containing single fibers of the flat cross section is disposed on the skin side, and in a polyester-based fiber containing single fibers of the circular cross section disposed on the opposite side to the skin side The water-absorbent knitted fabric according to Item 2, which is used.
Item 4. The water-absorbent knit according to any one of Items 1 to 3, wherein the value obtained by multiplying the number of wales between 1 inch and the number of courses between 1 inch is 1000 or more.
Item 5. The water-absorbent knitted fabric according to any one of Items 1 to 4, wherein the knitted fabric is a waffle tissue.

  The water-absorbent knitted fabric of the present invention has excellent water absorption and diffusibility and drying properties, and can suppress deterioration of water absorption and diffusivity and drying properties even after repeated washing, so it is used for clothing applications. Since it is possible to quickly absorb perspiration and to evaporate the collected perspiration quickly and dry it, it is possible to reduce discomfort at the time of perspiration.

It is the figure which showed the example of the cross section of the monofilament of the polyester-type fiber of flat cross section.

  The water-absorbent knit of the present invention is characterized in that it comprises a polyester-based fiber having a vinyl-based polymer obtained by polymerizing a vinyl-based compound represented by the general formula (1) attached to the surface. Hereinafter, the water absorbing knitted fabric of the present invention will be described in detail.

[Constructed fiber]
The water absorbing knitted fabric of the present invention contains polyester fibers as constituent yarns.

  The type of polyester resin constituting the polyester fiber is not particularly limited, and examples thereof include aromatic polyesters such as polyethylene terephthalate, polybutylene terephthalate and polytrimethylene terephthalate; cationic dyeable polyester, polylactic acid and the like . Among these, preferably aromatic polyester, more preferably polyethylene terephthalate is mentioned.

  The single fiber fineness of the polyester fiber is not particularly limited, and for example, 0.1 to 10 dtex, preferably 0.3 to 8 dtex, and more preferably 0.5 to 6 dtex can be mentioned.

  Further, the total fineness of the polyester fiber is not particularly limited, but for example, 30 to 300 dtex, preferably 50 to 250 dtex, and more preferably 70 to 180 dtex can be mentioned.

  The number of constituent filaments of the polyester fiber is determined depending on the single fiber fineness and the total fineness of the single fiber to be used, and examples thereof include 1 to 400.

  The cross-sectional shape (the shape of the cross section in the direction perpendicular to the length direction) of the monofilament of the polyester fiber is not particularly limited, and may be either a circular cross section or a flat cross section. Polyester fiber comprising single fiber of circular cross section (hereinafter, “circular cross section polyester fiber”) from the viewpoint of improving the capillary phenomenon developed by the water-absorbent fabric of the present invention and further enhancing the water absorption and diffusibility and the drying property. It is preferable to use in combination the polyester fiber (It may be described as the "flat cross-section polyester-type fiber" hereafter) containing the single fiber of a flat cross-section, and may be described.

  In the present invention, “circular cross section” indicates that the flatness of the cross-sectional shape is approximately 1. Further, in the present invention, the “flat cross section” indicates that the flatness of the cross-sectional shape is 1 to 5, preferably 1.2 to 2.8. The method of measuring the flatness is as described later.

  The shape of the cross section (cross section in the direction perpendicular to the longitudinal direction) of the flat cross section polyester fiber is not particularly limited, but as a suitable example, one or more in the outer peripheral portion (outline of the cross section) And the like. The number of the convex portions is, for example, 1 to 6, preferably 1 to 4 and more preferably 1 or 2. The shape shown in FIG. 1 is mentioned as an example of the cross section of flat cross-section polyester fiber. (A), (b) and (d) of FIG. 1 are an example having one convex portion on the outer peripheral portion, and (b) of FIG. 1 has two convex portions on the outer peripheral portion Is an example having As described above, by using the flat cross-section polyester fiber having one or more convex portions in the outer peripheral portion, a fine gap can be formed between the fibers, and it is possible to further improve the water absorption and diffusivity and the drying property. Become.

In the present invention, the flatness is a value obtained by calculating the flatness according to the following equation (1) for the total number of constituent filaments of the fiber to be measured, and calculating the average value thereof.
Flatness = (Length in the major axis direction of the fiber cross section) / (Length in the minor axis direction of the fiber cross section) (1)

  When using flat cross-section polyester fiber and circular cross-section polyester fiber together as constituent fibers of the water-absorbent knitted fabric of the present invention, from the viewpoint of efficiently absorbing sweat by capillary phenomenon developed by flat cross-section polyester fiber It is preferable to use a flat cross-section polyester-based fiber for the knitted fabric disposed on the side opposite to the skin side, and use a circular cross-sectional polyester-based fiber for the knitted fabric disposed on the skin side.

  In the water-absorbent knitted fabric of the present invention, other fibers may be contained as constituent fibers in addition to the polyester-based fibers, as long as the effects of the present invention are not impaired. Examples of such other fibers include synthetic fibers such as nylon and acrylic; regenerated fibers such as rayon; semi-synthetic fibers such as acetate; and natural fibers such as cotton and wool.

  In the water-absorbent knitted fabric of the present invention, the mixing ratio of polyester fiber is not particularly limited as long as desired water absorption and diffusibility and drying property can be exhibited, but for example, 50 mass% or more, preferably 80 mass% or more More preferably, 100 mass% is mentioned.

  Moreover, when using flat cross-section polyester-based fiber and circular cross-section polyester-based fiber together as constituent fibers of the water-absorbent knitted fabric of the present invention, the mixing ratio thereof is not particularly limited. Cross-section polyester fiber (mass ratio) = 5/95 to 50/50, preferably 10/90 to 50/50, more preferably 15/85 to 50/50. By including the flat cross-section polyester fiber and the circular cross-section polyester fiber at such a mixing ratio, it is possible to further improve the capillary phenomenon to be developed and to further enhance the water absorption and diffusivity and the drying property.

[Characteristics of knitting]
The knitting structure of the water-absorbent knitted fabric of the present invention may be appropriately set according to the application of the water-absorbent knitted fabric etc. For example, waffle, pomace, smooth, milling, fleece, kanko, picket, mesh, blister , Reversible organization, etc. Among these knitted structures, waffle tissue is suitable because it tends to exhibit capillary action and can further improve water absorption and diffusivity and dryness.

  In particular, when the knitted fabric of the present invention is a waffle structure, sweat is more likely to be diffused by the surface of the knitted fabric because it is a tissue having a binding thread, and the surface area is further increased by irregularities, further improving the drying property. It will be possible. In addition, when the knitted fabric of the present invention is formed into a waffle structure, the fibers disposed on the skin surface side and the fibers disposed as a binding thread exert a water transfer effect by capillary action, and therefore, are disposed on the opposite side to the skin side. Thin fibers having a fine fiber fineness are preferable to the fibers to be treated. As the waffle structure of this aspect, specifically, the single fiber fineness of the fibers disposed on the skin side: the single fiber fineness of the fibers disposed on the opposite side of the skin side, for example, 1: 8 to 1: 4. Can be mentioned.

  The knitting density of the water-absorbent knitted fabric of the present invention is not particularly limited, and may be appropriately set according to the application of the water-absorbent knitted fabric and the like. For example, the value calculated by multiplying the number of wales in one inch (number) and the number of courses in one inch (number) may be 1000 or more, preferably 1500 to 4000, and further preferably 1800 to 3800. By providing such a knitting density, it is possible to further improve the water absorption and diffusibility and the drying property. In particular, when the knitted structure is a waffle structure and has the above-mentioned knitted density, it is possible to significantly improve the water absorption and diffusibility and the drying property.

  In the water-absorbent fabric of the present invention, the number of wales per inch and the number of courses per inch may be appropriately set using the above-mentioned knitting density as a standard, for example, 40 to 100 courses / inch, preferably 50. And 80 courses / inch, and 30-80 wales / inch, preferably 40-60 wales / inch.

The basis weight of the water-absorbent knitted fabric of the present invention is not particularly limited, and for example, 100 to 300 g / m ² , preferably 150 to 300 g / m ² can be mentioned.

  The thickness of the water-absorbent knitted fabric of the present invention is not particularly limited and may be appropriately set according to the type of the applied garment and the like, but, for example, 0.5 to 1.5 mm can be mentioned. In particular, the water-absorbent knitted fabric of the present invention is characterized in that although it is thin, it can be provided with drying properties while having excellent water absorption and diffusion properties. In view of the characteristics of the water-absorbent knitted fabric of the present invention, one preferred embodiment of the water-absorbent knitted fabric of the present invention is one having a small thickness, and specifically, the thickness is preferably 0.6 to 1.0 mm can be mentioned.

[Surface modification of constituent fibers]
In the water-absorbent knit of the present invention, a vinyl-based polymer obtained by radical polymerization of a vinyl-based compound represented by the following general formula (1) is attached to the surface of the polyester-based fiber which is a constituent fiber. As described above, the polyester fiber is coated with a vinyl polymer having a specific structure, thereby providing excellent water absorption and diffusibility and drying properties, and suppressing deterioration in water absorption and diffusivity and drying properties even after repeated washing. It will be possible to

In the general formula (1), R ¹ and R ² are the same or different and are a hydrogen atom or a methyl group. As R ¹ and R ² , preferably, a methyl group is mentioned.

In general formula (1), R ³ is an alkylene group having 2 to 5 carbon atoms. R ³ preferably includes an alkylene group having 2 or 3 carbon atoms (ie, a methylene group or a propylene group), and more preferably an alkylene group having 2 carbon atoms (ie, a methylene group). When the carbon number is 3 to 5, the alkylene group of R ³ may be linear or branched.

  In general formula (1), n is an integer of 20-30. As described above, by using a vinyl polymer in which a vinyl compound having a large addition mole number of alkylene oxide is radically polymerized, the water absorption and diffusivity even when repeated washing while having excellent water absorption and diffusibility and drying property It becomes possible to suppress the decrease in dryness. When a vinyl-based polymer in which a vinyl-based compound in which n is smaller than 20 in the general formula (1) is radically polymerized is used, the water absorption and diffusibility and the drying property tend to be reduced, and when repeated washing, the water absorption and diffusivity and the drying property tend to be reduced appear. In the general formula (1), n is preferably 20 to 25, from the viewpoint of further effectively suppressing the decrease in water absorption / diffusion after drying and drying while further improving the water absorption / diffusion and drying. Particularly preferably, 23 is mentioned.

  The adhesion of the vinyl-based polymer to the surface of the polyester-based fiber is carried out by attaching a vinyl-based compound represented by the general formula (1) to a knitted fabric containing the polyester-based fiber and radically polymerizing it as described later. . Therefore, in the water-absorbent knitted fabric of the present invention, as the adhesion mode of the vinyl polymer to the surface of the polyester fiber, (i) an embodiment in which the vinyl polymer is chemically bonded to the surface of the polyester fiber ii) Of the embodiments in which the vinyl polymer is attached to the surface of the polyester fiber without chemical bonding, a combination of either one or both of the embodiments is envisioned.

In the water-absorbent knitted fabric of the present invention, the adhesion amount of the vinyl-based polymer may be appropriately set according to the water absorption and diffusibility to be imparted and the drying property, etc., for example, 0.5 to 12 mass%, preferably 1 -10 mass% is mentioned. Here, the adhesion amount of the vinyl-based polymer is a ratio of the vinyl-based polymer adhering to 100% by mass of the knitted fabric before the adhesion of the vinyl-based polymer, and is a value obtained according to the following equation.
Adhesion amount of vinyl polymer (% by mass) = {(W1−W0) / W0} × 100
W0: Weight per unit area of the knit used for producing the water-absorbent knit fabric W1: Weight per unit area of the water-absorbent knit fabric

  In the water-absorbent knit of the present invention, the film thickness of the adhering vinyl-based polymer is not particularly limited, but may be, for example, 50 to 200 nm, preferably 70 to 180 nm. In the present invention, the film thickness of the vinyl-based polymer is a value measured using a field emission scanning electron microscope.

  In the water-absorbent knit of the present invention, a resin other than the vinyl polymer and a crosslinking agent may be attached to the surface of the polyester fiber which is a component fiber, as needed. Examples of such resins and crosslinking agents include resins having reactive functional groups such as melamine resins, glyoxal resins and epoxy resins; and crosslinking agents such as imine crosslinking agents.

[Characteristics of water-absorbent knitted fabric]
The water-absorbent knit of the present invention has the property of being able to maintain excellent water absorption and diffusion even after repeated washing. As a preferred embodiment of the water absorption and diffusion (after washing) of the water absorbent knitted fabric of the present invention, after washing 100 times in accordance with JIS L 0001 140 method, the water absorption and diffusion area measured by the following test method is 500 mm ² Or more, preferably 500 to 1000 mm ² , more preferably 700 to 1000 mm ² .
<Measuring method of water absorption diffusion area>
From the water absorbent knitted fabric to be measured, a test piece of 20 cm long x 20 cm wide is prepared. Perform the operation specified in “7.1.1 Drop method” of “7.1 Water absorption rate method” of JIS L-1907: 2010 on the test piece to drop 40 μL of water on the skin surface side of the test piece Do. 60 seconds after water is dropped, the area of the area where the water is diffused is measured with a test piece, and this is taken as a water absorption and diffusion area.

In addition, the water-absorbent knitted fabric of the present invention has the property of being able to maintain excellent drying properties even after repeated washing. As a preferred embodiment of the drying property (after washing) of the water-absorbent knitted fabric of the present invention, the drying time measured by the following test method is 70 minutes or less after performing washing according to the JIS L 0001 140 method 100 times, Preferably 40 to 70 minutes, more preferably 40 to 55 minutes can be mentioned.
<Method of measuring drying time>
From the water-absorbent knitted fabric to be measured, a test piece of 10 cm long × 10 cm wide is prepared. The test piece is placed on the weight measuring device under the environment of 20 ° C. and 60% RH so that the skin side is on the top. Next, 0.6 ml of water is dropped onto the test piece, and the weight is measured over time, and it takes 5.4 g of water to evaporate (the remaining amount of water in the test piece becomes 0.6 g). Determine the time, and let this be the drying time.

[Uses of water-absorbent knitted fabric]
The water absorbing knitted fabric of the present invention can efficiently absorb sweat and efficiently evaporate the absorbed sweat, and therefore, is suitably used as a material of various clothes such as sportswear, innerwear, uniforms and the like.

[Method of producing water-absorbent knitted fabric]
The water-absorbent knitted fabric of the present invention can be produced by contacting a vinyl-based compound represented by the general formula (1) with a knitted fabric containing polyester-based fibers, and radically polymerizing the vinyl-based compound.

  The knitted fabric containing polyester fibers can be obtained by knitting using a known knitting machine. In addition, the knitted fabric containing polyester fibers may be subjected to processing such as known scouring treatment and dyeing treatment before being brought into contact with the vinyl compound shown in the general formula (1).

  In order to bring the vinyl compound represented by the general formula (1) into contact with the knitted fabric containing polyester fiber, the knitted fabric is impregnated with a treatment liquid containing the vinyl compound represented by the general formula (1). Just do it.

Examples of the treatment liquid include an aqueous solution in which the vinyl compound represented by the general formula (1) is dispersed or dissolved. The concentration of the vinyl-based compound represented by the general formula (1) in the treatment liquid may be appropriately set according to the amount of vinyl-based polymer to be attached, the conditions of radical polymerization, etc., for example, 5 to 100 g / L , Preferably 8 to 90 g / L.

  Moreover, in order to accelerate | stimulate the radical polymerization of the vinyl-type compound shown to the said General formula (1), the said processing liquid may contain the polymerization initiator. Examples of the polymerization initiator include ammonium persulfate, potassium peroxide, hydrogen peroxide, benzoyl peroxide, azobisisobutyronitrile, t-butyl peroxide and the like. One of these polymerization initiators may be used alone, or two or more thereof may be used in combination. The concentration of the polymerization initiator in the treatment liquid is not particularly limited and may be appropriately set according to the type of the polymerization initiator to be used, for example, 0.2 to 5 g / L, preferably 0.3 -4 g / L are mentioned.

  With respect to the amount of impregnation of the treatment liquid with respect to the knitted fabric containing polyester fibers, the concentration of the vinyl compound represented by the general formula (1) in the treatment liquid, the amount of vinyl polymer to be attached, the conditions of radical polymerization, etc. However, for example, 1 to 20 parts by mass, preferably 3 to 10 parts by mass, and more preferably 5 to 7 parts by mass of the treatment solution per 100 parts by mass of a knitted fabric containing polyester fibers. It can be mentioned.

  The water-absorbent fabric of the present invention can be obtained by impregnating a knitted fabric containing polyester-based fibers with the treatment liquid and then radically polymerizing the vinyl-based compound represented by the general formula (1).

  In order to radically polymerize the vinyl compound represented by the general formula (1), for example, a wet heat treatment, an exhaustion treatment, an electron beam treatment, an ultraviolet ray treatment, a microwave treatment or the like may be performed. The conditions of the radical polymerization may be appropriately selected according to the type of treatment to be employed, the concentration of the vinyl compound shown in the general formula (1) in the treatment liquid, the amount of the vinyl polymer to be attached, etc. In the case of wet heat treatment, treatment may be performed in the presence of steam at 80 to 180 ° C. for 1 to 30 minutes.

  Thus, after radical polymerization is carried out, washing treatment and drying treatment may be carried out, if necessary.

  Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited by the following examples.

1. Measurement / Test Method Measurement and evaluation in the following Examples and Comparative Examples were performed according to the following methods.
(1) Measurement of water absorption and diffusion area The water absorption and diffusion area of the water absorbent knitted fabric after washing 100 times according to the JIS L 0001 140 method was measured by the following method.

  From the water-absorbent fabric to be measured, a test piece of 20 cm long x 20 cm wide was prepared. Perform the operation specified in “7.1.1 Drop method” of “7.1 Water absorption rate method” of JIS L-1907: 2010 on the test piece to drop 40 μL of water on the skin surface side of the test piece did. 60 seconds after water was dropped, the area of the area where water was diffused was measured with a test piece, and this was determined as the water absorption and diffusion area.

(2) Measurement of drying time The drying time of the water absorbent knitted fabric after washing 100 times according to JIS L 0001 140 method was measured by the following method.

  A test piece of 10 cm long × 10 cm wide was prepared from the water absorbent knitted fabric to be measured. The test piece was placed on the weight measuring device in an environment of 20 ° C. and 60% RH so that the skin surface side was on the upper side. Next, 0.6 ml of water is dropped onto the test piece, and the weight is measured over time, and it takes 5.4 g of water to evaporate (the remaining amount of water in the test piece becomes 0.6 g). The time was determined and this was taken as the drying time.

(3) Adhesion amount of surface treatment agent The addition amount (% by mass) of the surface treatment agent was determined according to the following equation for the water-absorbent knitted fabric after production.
Attached amount of surface treatment agent (mass%) = {(W1−W0) / W0} × 100
W0: Weight per unit area of the knit used for producing the water-absorbent knit fabric W1: Weight per unit area of the water-absorbent knit fabric

(4) Thickness of knitted fabric The thickness of the water-absorbent knitted fabric was measured according to JIS L1096 8.4 Thickness A method.

(5) Flatness and Number of Convex Portions A flat fiber with a flat cross section is cut, and the cross section is observed at a magnification of 100 times using an optical microscope ("Microscope VHX-900" manufactured by Keyence Corporation). I asked for the number. Moreover, the image observed with the said optical microscope was analyzed, flatness was calculated | required according to following formula (1) about the total number of the component filaments of a fiber, and the average value was computed.
Flatness = (Length in the major axis direction of the fiber cross section) / (Length in the minor axis direction of the fiber cross section) (1)

(6) Film thickness of surface treatment agent The fiber cross section contained in the water absorbing knitted fabric was photographed at 20000 magnification with an electrolytic radiation scanning electron microscope ("SU 8020", manufactured by Hitachi High-Technologies Corporation), and five fiber cross sections The film thickness formed of the surface treatment agent was measured, and the average value was calculated.

2. Production of water-absorbent knitted fabric (Example 1)
Polyester fiber (trade name "Lumiace", manufactured by Unitika Trading Co., Ltd., 84 dtex 48 filaments, the number of projections is one, flatness is one, and the surface (surface opposite to the skin side) contains single fiber of flat cross section .6, mixing ratio 17 mass%), polyester fiber (167 dtex 72 filaments, mixing ratio 57.8 mass%, flatness is approximately 1) containing single fiber of circular cross section on the back surface (skin side), circular cross section to tie yarn Using a polyester fiber (84 dtex 72 filaments, a mixing ratio of 25.2% by mass, a flatness of approximately 1) containing monofilaments, and using a Fukuhara Seiki circular knitting machine (LPJ33 ′ ′ 28 G) The obtained knitted fabric was treated with Circular MF (manufactured by Hisaka Seisakusho Co., Ltd.) at a temperature of 80 ° C. for 20 minutes under the conditions of Sanmall FL (Nikka Chemical Co., Ltd.). Made by company) 1g / l scoured, pre-set for 30 seconds at 190 ° C with a tenter (made by Ichigane Kogyo Co., Ltd.), flow dyeing machine Circular MF (made by Nisaka Seisakusho Co., Ltd.) with the following staining prescription At a temperature of 130.degree. C. for 30 minutes.
<Staining prescription>
-Dianix Blue UN-SE (manufactured by Dystar) 1% o. m. f
・ Nikka sun salt SN-130 (dispersant made by Nikka Chemical Co., Ltd.) 0.5 g / l
Acetic acid (48%) 0.2 cc / l
・ Water remaining part

  Then, the knitted fabric was dipped in the treatment liquid of the following formulation 1, and squeezed with a mangle at a reduction ratio of 80%. Then, it was made to stay for 7 minutes in 100 degreeC normal pressure steam, and radical polymerization of the vinyl compound was performed. Then, after washing in an expanded state using an open soaper, 5 minutes liquid flow washing was performed at 60 ° C. Next, drying was performed at 120 ° C. for 40 seconds with a drier, and heat treatment was further performed at 140 ° C. for 1 minute with a tenter to obtain a water-absorbent knit (53 courses / inch, 46 wales / inch).

<Prescription 1>
-Surface treatment agent A 30 g / L
・ Ammonium persulfate 1.5 g / L
Water Residue As the surface treatment agent A, a vinyl compound (a vinyl compound in which R ¹ and R ² are a methyl group, R ³ is an ethylene group, and n is 23 in the general formula (1); “NK ester” 23G ", Shin-Nakamura Chemical Co., Ltd.) was used.

(Example 2)
A water-absorbent knit was obtained under the same conditions as in Example 1 except that the treatment liquid of the following formulation 2 was used instead of the treatment liquid of formulation 1.
<Prescription 2>
・ Surface treating agent A 70 g / L
・ Ammonium persulfate 3.5 g / L
Water Residue The surface treatment agent A is the same as that used in the formulation 2.

(Example 3)
A polyester-based fiber (84 dtex 36 filaments, flatness is approximately 1) containing a single fiber of circular cross section was used to make a knitted fabric of punch structure by using Fukuhara Seiki's circular knitting machine (LPJ33 "28G).

  The obtained knitted fabric is subjected to scouring, dyeing and processing, and treatment with the treatment liquid of Formulation 1 under the same conditions as in Example 1 to obtain a water-absorbent knitted fabric (76 courses / inch, 49 wales / inch). The

(Example 4)
The knit fabric of punch tissue prepared in Example 3 was subjected to scouring, dyeing and processing, and treatment with formulation 2 under the same conditions as in Example 2 to obtain a water-absorbent knit.

(Example 5)
A polyester-based fiber (84 dtex 36 filaments, flatness is about 1) containing a single fiber of circular cross section was used to make a knitted fabric having a smooth structure by using Fukuhara Seiki's circular knitting machine (LPJ33 "28G).

  The obtained knitted fabric is subjected to scouring, dyeing and processing, and treatment with the treatment liquid of Formulation 1 under the same conditions as in Example 1 to obtain a water-absorbent knitted fabric (60 courses / inch, 43 wales / inch). The

(Example 6)
The smooth knitted fabric prepared in Example 5 was subjected to scouring, dyeing and processing, and treatment with formulation 2 under the same conditions as in Example 2 to obtain a water-absorbent knit.

(Comparative example 1)
A water-absorbent knit was obtained under the same conditions as in Example 1 except that the treatment liquid of the following formulation 3 was used instead of the treatment liquid of formulation 1.
<Prescription 3>
・ Surface treating agent B 30 g / L
・ Ammonium persulfate 1.5 g / L
Water Residue As the surface treatment agent B, a vinyl compound (a vinyl compound in which R ¹ and R ² are a methyl group, R ³ is an ethylene group, and n is 14 in the general formula (1); “NK ester” 14G, Shin-Nakamura Chemical Co., Ltd.) was used.

(Comparative example 2)
A water-absorbent knit was obtained under the same conditions as in Example 1 except that the treatment liquid of the following formulation 4 was used instead of the treatment liquid of formulation 1.
<Prescription 4>
· Surface treatment agent B 70 g / L
・ Ammonium persulfate 3.5 g / L
Water Residue The surface treatment agent B is the same as that used in the formulation 3.

(Comparative example 3)
Under the same conditions as in Example 1 above, a knitted fabric of waffle structure was woven and subjected to scouring and dyeing. Then, the knitted fabric was immersed in the processing solution of the following formulation 5 and squeezed with a mangle at a squeezing rate of 80%. Next, drying was carried out at 120 ° C. for 2 minutes with a drier, and heat treatment was further carried out at 170 ° C. for 1 minute with a tenter to obtain a water-absorbent knit.
<Prescription 5>
・ Surface treating agent C 20 g / L
・ Metal salt catalyst A 7 g / L
Water Residue As the surface treatment agent C, a polyester-based water absorbent (“SR6200” manufactured by Takamatsu Yushi Co., Ltd.) was used. Moreover, ("SR-CA-1", Takamatsu Yushi Co., Ltd. make) was used as the metal salt type catalyst A.

(Comparative example 4)
A water-absorbent knit was obtained under the same conditions as in Comparative Example 3 except that the treatment liquid of the following formulation 6 was used instead of the treatment liquid of formulation 5.
<Prescription 6>
・ Surface treating agent D 20 g / L
Water Residue As the surface treatment agent D, a polyester-based water-absorbing agent ("Chlamical RX 100" manufactured by Keihin Kasei Co., Ltd.) was used.

3. Results The results are shown in Table 1. As a result, in the water absorbing knitted fabrics of Comparative Examples 3 and 4 using the conventional water absorbing agent as the surface treatment agent, the water absorption and diffusion area and the drying time are significantly reduced after 100 washings, and the durability is insufficient. there were. Also, in comparison with Comparative Examples 1 and 2 in which radical polymerization was carried out using a vinyl compound in which n is 14 in General Formula (1) as the surface treatment agent, n is 23 in General Formula (1) as the surface treatment agent. In Examples 1 and 2 in which radical polymerization was carried out using a vinyl compound, the water absorption and diffusion area immediately after production was wide, and the drying time was shortened, and even after 100 times of washing, the water absorption and diffusion area and drying time were Was kept stable. Moreover, in Examples 3-6, although the waffle structure | tissue was not employ | adopted as a knitted fabric structure | tissue, the water absorption diffusion area and the drying time were hold | maintained stably. Moreover, Example 1 and 2 which employ | adopted the waffle structure | tissue as knitting structure was further excellent by water absorption diffusivity and dryness compared with Examples 3-6 which employ | adopted the other structure | tissue.

  Although it is not desired to have a limited interpretation, in Examples 1 to 6, n is 23 in the general formula (1) for the reason that excellent water absorption and diffusibility and drying property are recognized immediately after production and after 100 times washing. The vinyl compound of this group has a large added mole number of ethylene oxide and high hydrophilicity, but by being graft-polymerized, excessive swelling is suppressed and a film is formed with good adhesion to polyester fibers. It is guessed.

Claims (5)

A water-absorbent knit comprising a polyester-based fiber to which a vinyl-based polymer obtained by polymerizing a vinyl-based compound represented by the following general formula (1) is attached to the surface.

[In the general formula (1), R ¹ and R ² are the same or different and each represents a hydrogen atom or a methyl group, R ³ represents an alkylene group having 2 to 5 carbon atoms, n is an integer of 20-30. ]   The water-absorbent knit according to claim 1, wherein the polyester fiber comprises a polyester-based fiber containing a single fiber of flat cross section and a polyester-based fiber containing a single fiber of circular cross section.   In a knitted fabric in which a polyester-based fiber containing single fibers of the flat cross section is disposed on the opposite side to the skin side, and in a polyester-based fiber containing single fibers of the circular cross section is disposed on the skin side The water-absorbent knit according to claim 2, which is used.   The water-absorbent fabric according to any one of claims 1 to 3, wherein the value obtained by multiplying the number of wales between 1 inch and the number of courses between 1 inch is 1000 or more.   The water-absorbent fabric according to any one of claims 1 to 4, wherein the knitted fabric is a waffle tissue.

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