KR101775670B1

KR101775670B1 - Composite nonwoven fabric for absorber and absorbent article using the same

Info

Publication number: KR101775670B1
Application number: KR1020150154669A
Authority: KR
Inventors: 임정남; 도성준; 김태희; 김윤진; 김가희; 이규동; 김채화
Original assignee: 한국생산기술연구원
Priority date: 2015-11-04
Filing date: 2015-11-04
Publication date: 2017-09-06
Also published as: KR20170052342A

Abstract

A composite nonwoven fabric for an absorber comprising a regenerated cellulose hollow fiber and a polyacrylic acid based superabsorbent fiber and an absorber article having the same are presented.

Description

TECHNICAL FIELD [0001] The present invention relates to a composite nonwoven fabric for absorbers and an absorbent article having the same,

The present invention relates to a composite nonwoven fabric for an absorber and an absorber article having the composite nonwoven fabric, and more particularly to a composite nonwoven fabric for an absorber capable of being reused because of its excellent liquid-absorbability and liquid- will be.

Generally, urinary incontinence is one of the diseases that arise with age, and it causes a great problem in social life, and also has a problem of activity that shrinks the radius of action in outdoor activities.

Especially in recent years, the incidence of incontinence problems in women as well as men has increased, and there is a desperate need for measures to cope with urinary incontinence as well as natural coping.

As the number of people experiencing urinary incontinence has increased in recent years, the market for incontinence sanitary products in Korea is expected to grow rapidly from 50 billion won in 2008 to 100 billion won by the end of 2013 and to 240 billion won in 2020 .

As the aging rate increases, the sanitary paper market for seniors is expanding. About 40% of women who have given birth and 24% of men in their 60s due to prostate problems experience incontinence symptoms.

Disposable pads or pant diaper type products have been developed for the treatment of urinary incontinence. However, when wearing the diaper type product, the products that combine underwear and incontinence pads have attracted great interest due to psychological rejection problems such as shame.

In the field of absorbers for sanitary articles such as urinary incontinence pads, there is a strong demand for not only high resorption but also miniaturization and thinness, and accordingly, it is required to improve the performance of the repair material in the absorbent body and the morphological stability.

Conventionally, powder absorbers and fibrous absorbers have been known as powder absorbers. Polyacrylic absorbers based on synthetic polymers such as polyacrylic acid-based compounds and polyvinyl-based compounds have been known. Cyanomethyl cellulose, carboxymethyl cellulose and the like are known.

Examples of the fibrous polymeric absorbers include fibers prepared by mixing sodium salt of carboxymethyl cellulose in viscose rayon and spinning, fibers prepared by carboxymethylation of regenerated cellulose fibers, and acrylonitrile Fibers having a double structure in which a fiber is hydrolyzed and a polyacrylic acid-based absorbent layer is formed on the outer surface thereof.

At this time, in the case of the powdery absorbent material, it may cause aggregation or escape from the absorbent body during the manufacturing process or circulation process, and also may not be reusable because of the form stability due to the aggregation phenomenon, The absorbent body moves in accordance with the movement of the wearer, so that the distribution in the absorbent body tends to be shifted to one side and sticky, which may cause discomfort to the wearer.

On the other hand, since the fibrous absorbent material prepared by mixing the viscose rayon sodium salt of carboxymethyl cellulose with both of the viscose rayon and the carboxymethyl cellulose is of the cellulose type, it has an advantage of being highly usable and having characteristics as fibers , Water retention is insufficient, the entire fiber has absorbency, and when the fiber is absorbed, the fiber itself becomes a gel, which lowers the morphological stability and low fiber strength at the time of drying.

In addition, when cotton fibers or synthetic fibers are made into a nonwoven fabric and used as an absorbing material, they have a problem of low liquid retentivity, which is a capability of retaining liquid when pressure is applied, although its shape stability is excellent.

On the other hand, when the polyacrylic acid-based superabsorbent fiber is used as the absorbing material, the absorbing ability is excellent, but when the absorbing liquid is gelled, the propagation speed of the liquid absorbed by the gel blocking phenomenon is lowered and the swelling is greatly increased, The absorption efficiency may be deteriorated. Therefore, when a polyacrylic acid-based superabsorbent fiber is used singly, its effect is limited even when a high content is used. In addition, it is not easy to reuse due to gelation or touch reduction during absorption, and is buried mainly for disposal after use. However, there is a concern about environmental pollution because it is not biodegraded.

Therefore, there is a great need for development of underwear for coping with urinary incontinence which is excellent in absorption characteristic, and has design, activity, comfort, and ease.

A problem to be solved by the present invention is to provide a composite nonwoven fabric for an absorber which is excellent in absorbing and lyophobic property and excellent in shape stability and can be reused, and an absorbent article having the same.

According to one aspect of the present invention, there is provided a composite nonwoven fabric for an absorber of the following embodiments.

A first embodiment provides a composite nonwoven fabric for an absorber comprising a regenerated cellulose hollow fiber and a polyacrylic acid-based superabsorbent fiber and having a basis weight of 120 g / m ² or more.

The second embodiment, in the first embodiment,

And a weight ratio of the regenerated cellulose hollow fiber to the polyacrylic acid-based superabsorbent fiber is 90: 10 to 10: 90.

The third embodiment is, in the first embodiment or the second embodiment,

Wherein the regenerated cellulose hollow fiber has a hollow ratio of 30% or more when wetted and the hollow ratio (%) is calculated as (the total area of the hollow in the cross section of the hollow fiber) / (the cross sectional area of the hollow fiber including the hollow) * 100 .

The fourth embodiment is, in any one of the first to third embodiments,

Wherein the polyacrylic acid based superabsorbent fiber has a liquid absorbency of not less than 10 g / g with respect to 0.9% physiological saline.

The fifth embodiment is, in any one of the first through fourth embodiments,

And a liquid absorbency of 0.40 g / cm < ² > or more with respect to 0.9% physiological saline in the composite nonwoven fabric for absorbers.

The sixth embodiment is, in any one of the first through fifth embodiments,

Wherein the composite nonwoven fabric for absorber has a liquidus permeability of 0.25 g / cm < ² > or more after pressurization of 40 mmHg after absorbing 0.9% physiological saline.

The seventh embodiment is, in any one of the first through sixth embodiments,

Woven fabric for absorber composite nonwoven fabric having absorbency of 0.20 g / cm < ² > or more to 0.9% physiological saline under a pressure of 10 mmHg.

The eighth embodiment is, in any one of the first through seventh embodiments,

Wherein the absorbency maintenance ratio of the composite nonwoven fabric for absorbent article is 85% or more and the absorbency maintenance ratio is calculated as follows.

Liquid absorption rate retention rate (%) = (absorption rate after 5 times of absorption = drying) / (initial liquid absorption rate) * 100

(G / g) = initial weight (g) - initial weight (g) / initial weight (g)

(G / g) = [weight after absorbing 5 times of absorbing liquid 5 times after absorbing liquid 5 times (g) absorbing liquid 5 times of weight after drying 5 times / absorbing liquid 5 Weight (g)]

The ninth embodiment is, in any one of the first through seventh embodiments,

Wherein the absorber composite nonwoven fabric further comprises binder fibers of up to 40 parts by weight based on 100 parts by weight of the total of the regenerated cellulose hollow fibers and the polyacrylic acid based superabsorbent fibers.

According to an aspect of the present invention, there is provided an absorbent article of the following embodiment.

The tenth embodiment relates to an absorber article having a composite nonwoven fabric for an absorber according to any one of the first to ninth embodiments.

The composite nonwoven fabric for absorbers according to one embodiment of the present invention uses hollow regenerated cellulose fibers and polyacrylic acid-based superabsorbent fibers to improve the absorbency, lyophobicity, and absorbency upon pressing, It is possible to prevent the aggregation phenomenon occurring in the conventional powdery absorbent material and to reuse it, so that it can be utilized in underwear products for the treatment of urinary incontinence.

Therefore, the technology applied to incontinence / sanitary panties currently available on the market can solve the problem that the functionality is not enough to carry extra panties even if the recyclability, outdoor activity, and comfortability portions are significantly lowered and the urine volume is slightly increased.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further augment the technical spirit of the invention. And should not be construed as limiting.
1 is an SEM photograph of the surface of the composite nonwoven fabric for absorber of Example 1. Fig.
2 is a SEM photograph of a section of the viscose rayon hollow fiber used in Example 1 at the time of absorption.
3 is a graph showing the absorption rate retention ratio of the composite nonwoven fabric for absorbers of Example 2 and Comparative Example 1. Fig.

Hereinafter, the present invention will be described in detail. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the configurations shown in the embodiments described herein are merely the most preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

The composite nonwoven fabric for an absorber according to one aspect of the present invention includes a regenerated cellulose hollow fiber and a polyacrylic acid-based superabsorbent fiber and has a basis weight of 120 g / m ² or more.

As used herein, the term " cellulose " refers to a polymer structure including three hydroxyl groups per unit structure as represented by the following formula (1).

&Lt; Formula 1 >

The hydroxyl groups contained in the unit structure of the cellulose regularly participate in intermolecular and intramolecular hydrogen bonding. Because of this hydrogen bonding, cellulose has a strong crystal structure, so cellulose has a stable structure that is insoluble in water or organic solvents.

Therefore, in order to produce a fiber product from cellulose having a stable crystal structure, the crystal structure of cellulose must first be destroyed. Since the cellulose in which the crystal structure is broken becomes soluble in organic solvents, regenerated cellulose fibers can be produced from the cellulose fiber by dry spinning or wet spinning.

That is, the regenerated cellulose fibers are regenerated after chemically and physically changing the natural cellulose. Examples of such regenerated cellulose fibers include viscose rayon, cuprammonium rayon, acetate rayon, Cell (lyocell), polynosic rayon, and the like.

At this time, the viscose rayon is prepared by wet-spinning a solution synthesized through a carbon disulfide reaction after alkaline pretreatment of cellulose, and has a serrated skin-core structure, a unique gloss and a smooth surface . In addition, the acetate rayon is prepared by dissolving cellulose acetate in a low-boiling organic solvent such as acetone, followed by dry spinning.

In one embodiment of the present invention, the regenerated cellulose hollow fiber refers to a hollow fiber having voids inside the above-mentioned regenerated cellulose fibers. The void space is continuously formed in the longitudinal direction of the fibers, Or may be discontinuously formed like bamboo.

This hollow space, that is, the hollow part, can be formed in various shapes such as a round shape, a square shape, a field shape, a well shape, and the like, Hollow ratio) can be determined.

Also, a single hollow form may be formed in the regenerated cellulose fibers, or a plurality of hollow forms may be intermittently or continuously connected while being formed parallel or mutually irregularly.

The hollow fiber according to an embodiment of the present invention may have a constant hollow structure in the dry state and a wet state, or may have a hollow cross-sectional structure collapsed into a flat shape in a dry state, but the hollow portion is expanded in a wet state The hollow ratio in the dry state and the hollow ratio in the wet state may be different from each other.

Accordingly, in the present specification, the hollow ratio of the hollow fiber is calculated on the basis of the hollow ratio when wetting, that is, the state when the hollow portion is expanded.

That is, hollow fiber was immersed in distilled water for 10 minutes, lyophilized and measured by a scanning electron microscope (SEM), or the fibers dipped in distilled water for 10 minutes were observed through a light microscope to observe the cross section in the radial direction do.

The hollow ratio (%) is obtained by measuring the cross-sectional area in the radial direction of the fiber including the hollow using an optical instrument, measuring the total area of the hollow portion, and measuring the total area of the hollow portion in the radial direction Is calculated as a percentage of the sum of the areas of the hollows in the cross section of the hollow. At this time, if there is a plurality of hollow portions but not a single hollow portion, the total area of the plurality of hollow portions is calculated

Hollow ratio (%) = (total area of the hollow portion in the cross section of the hollow fiber) / (cross sectional area of the hollow fiber including the hollow) * 100

According to one embodiment of the present invention, the regenerated cellulose hollow fiber may have a hollow ratio of at least 30%, preferably at least 40%, more preferably at least 50 to 90% at the time of wetting.

The polyacrylic acid-based superabsorbent fiber is a polyacrylic acid-based fiber obtained by hydrophilization of molecules and / or high crosslinking treatment by a polymer modification technique, and has a hygroscopic property And can have a high moisture absorption rate of 40% or more under the environment of 20 ° C and 65% RH.

Specifically, the polyacrylic acid-based superabsorbent fiber means a polymer fiber of a hydrophilic acrylic acid-based unsaturated monomer, and examples thereof include polyacrylic acid fiber, alkali metal salt fiber of polyacrylic acid, alkaline earth metal salt of polyacrylic acid and the like. At this time, examples of the alkali metal salt fibers of polyacrylic acid include sodium polyacrylate fibers and calcium polyacrylate fibers.

The polyacrylic acid-based superabsorbent fiber may be formed of a homopolymer (homopolymer) of an alkali metal salt of acrylic acid, an alkaline earth metal salt of acrylic acid, or a copolymer of two or more thereof. In addition to these monomers, methacrylic acid, Examples of the anion such as maleic acid, vinylsulfonic acid, styrenesulfonic acid, 2- (meth) acrylamide-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2- (Meth) acrylamide, N-ethyl (meth) acrylamide, Nn-propyl (meth) acrylamide, N-isopropyl Acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, polyethylene glycol mono , Nonionic hydrophilic group-containing unsaturated monomers such as vinylpyridine, N-vinylpyrrolidone, N-acryloylpiperidine and N-acryloylpyrrolidine; N, N-dimethylaminoethyl (meth) Such as N, N-diethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylamide and quaternary salts thereof And may further be formed of a copolymer containing one or more other unsaturated monomers such as unsaturated monomers and the like.

When further containing these other unsaturated monomers, the content of the other unsaturated monomer may be 30 mol% or less, preferably 10 mol% or less, in the polyacrylic acid-based superabsorbent fiber.

According to one embodiment of the present invention, the polyacrylic acid-based superabsorbent fiber may have a liquid absorption rate of not less than 10 g / g, preferably not less than 30 g / g, and more preferably not less than 40 g / g with respect to 0.9% physiological saline.

The composite nonwoven fabric for an absorber according to an embodiment of the present invention has a density of 120 g / m ² or more, preferably 120 to 1,000 g / m ² , more preferably 130 to 750 g / m ² , It can have a basis weight of 500 g / m ² . Here, the basis weight refers to the weight of the nonwoven fabric having a certain area, specifically, the weight of the nonwoven fabric having an area of 1 m ² expressed in g.

As used herein, fiber or yarn refers to a group of linear filaments that are long, thin, and small in bending resistance, and can bend tenderly.

Further, the nonwoven fabric may be arranged by arranging the fibers in parallel or in an indefinite direction without going through a woven fabric process and mechanically entangling the fibers or adding a resin adhesive, heat-sealing, or forming a chemical composite Means a kind of fiber structure obtained.

Such a nonwoven fabric may be produced by various methods such as wet (or immersed or superficially), dry, spun lace, and the like.

Among them, the dry nonwoven fabric is prepared by mixing a chemical bonding nonwoven fabric, which is manufactured through a drying process by penetrating an adhesive onto a fiber, and a fiber having a low melting point, and bonding the fiber structure by heat or pressure, thermal bonding nonwoven fabric, air lay nonwoven fabric manufactured by using compressed air and an adhesive, and fibers formed by carding and forming the web into a single layer or water layer in accordance with a desired basis weight, A needle punching nonwoven fabric manufactured by physically joining webs using needles, and the like, and it is preferable from the viewpoint of improving tensile strength, i.e., morphological stability, of the nonwoven fabric.

According to an embodiment of the present invention, the regenerated cellulose hollow fiber and the polyacrylic acid-based superabsorbent fiber may be short fibers for dry nonwoven fabric (staple fiber) having a length of 5 to 130 mm, more preferably 10 to 60 mm .

The fineness of the regenerated cellulose hollow fiber and the polyacrylic acid-based superabsorbent fiber may be independently from 0.5 dtex to 20 dtex, preferably from 1 to 15 dtex.

When the fiber length and fineness satisfy the above range, opening (opening) in the dry nonwoven fabric manufacturing process is easy, and morphological stability can be improved.

According to one embodiment of the present invention, the weight ratio of the regenerated cellulose hollow fiber and the polyacrylic acid-based superabsorbent fiber in the composite nonwoven fabric for absorbent article is 90:10 to 10:90, or 90:10 to 40:60, or 90:10 To 50:50, or from 90:10 to 70:30. When the weight ratio satisfies the above range, the liquid-absorbing property, the liquid-absorbing property, the liquid-absorbing property upon pressing, the excellent form stability, and the excellent liquid-absorbing property can be exhibited even by repeated absorption and drying. In particular, when the weight ratio of the regenerated cellulose hollow fiber and the regenerated cellulose hollow fiber among the polyacrylic acid based superabsorbent fibers is 50 weight ratio or more, more preferably 70 weight ratio or more, the tactile feeling and the form stability can be more excellent.

In the case of an absorber which absorbs a large amount of urine or blood, excellent liquid absorption characteristics are required. In addition, it is important from the standpoint of comfort and the like that the liquid absorbed even under a certain pressing environment does not leak out and stays in the absorber.

The absorbent composite nonwoven fabric may have a liquid absorbency of 0.40 g / cm ² or more, preferably 0.45 to 3.0 g / cm ² , more preferably 0.50 to 2.5 g / cm ² with respect to 0.9% physiological saline.

The absorbency is calculated by the following formula after immersing the composite nonwoven fabric for absorber in 0.9% physiological saline at 25 ° C for 10 minutes, measuring the weight before and after the absorption.

Absorption rate (g / c㎡ ) = [ Absorption Post Weight (g) - Absorption Total weight (g)] / [area of nonwoven fabric ( c㎡ )]

The absorbent composite nonwoven fabric may have a lubrication ratio of 0.25 g / cm ² or more, preferably 0.30 to 2.5 g / cm ² , more preferably 0.35 to 2.0 g / cm ² , after pressurization of 40 mmHg after 0.9% ² < / RTI >

The weight of the nonwoven fabric was measured by measuring the weight of the nonwoven fabric after the pressure was applied to the absorbed nonwoven fabric at a pressure of 40 mmHg for 1 minute, .

Moisture content (g / c㎡ ) = [40 MmHg Weight after pressing (g) - Absorption Total weight (g)] / [area of nonwoven fabric ( c㎡ )]

On the other hand, in the case of an absorber for urinary incontinence, a diaper, a sanitary article for women, a wound dressing, etc., a certain level of pressure is applied when it is used in a sitting or lying state in an actual use environment. Therefore, for use as a high absorber, it is very important to evaluate the adsorption rate in a pressurized environment.

The absorbent composite nonwoven fabric preferably has a liquid absorbency of 0.20 g / cm ² or more, preferably 0.25 to 2.5 g / cm ² , more preferably 0.30 to 2.0 g / cm ² , in 0.9% physiological saline under a pressure of 10 mmHg ² < / RTI >

At this time, the absorbency at a pressure of 10 mmHg is calculated by measuring the weight after 10 minutes of immersion in 0.9% physiological saline at 25 ° C in a state of applying 10 mmHg of pressure to the composite nonwoven fabric for absorber for 10 minutes.

(G / cm < 2 >) = [weight after absorbing in a pressurized state of 10 mmHg (g) - weight before absorbing liquid (g)] /

Further, in order to use as a high absorber which can be used for multiple use rather than as a disposable product, it is preferable to maintain a certain level of absorption characteristics even under conditions of repeated washing and drying. Therefore, it is very important to evaluate the retention of the absorbency of the composite nonwoven fabric for absorbers in washing and drying environments.

The absorbency maintenance ratio of the composite nonwoven fabric for absorbers according to one embodiment of the present invention is 85% or more, preferably 90 to 150%, more preferably 90 to 120%.

At this time, the absorption rate retention rate is calculated by the following formula.

Here, the initial liquid-absorbency and the liquid-absorbency after five times of absorption-drying are calculated as follows.

first Absorption rate (g / g) = [initial Absorption (G) - initial weight (g)] / [initial weight (g)]

At this time, the liquid absorptivity retentivity is calculated by measuring the weight of the composite nonwoven fabric for absorber after immersing in distilled water for 10 minutes and before and after the liquid absorptions. After measuring the liquid absorptivity each time, it is dried for 7 hours or more in a hot- The method of measurement is to measure the liquid-absorbency by repeating the liquid-absorbing and the drying five times. At this time, saline is contained in the saline solution, which may affect the weight change, and repeated experiments for measuring the water uptake rate continue to distilled water.

According to one embodiment of the present invention, the composite nonwoven fabric for absorbers may further include binder fibers on at least one side or both sides of the composite nonwoven fabric.

Such a binder fiber can be applied as long as it can reinforce the structure while binding the regenerated cellulose hollow fiber with the polyacrylic acid type superabsorbent fiber by a method such as hot air bonding, chemical bonding, physical bonding, ultrasonic bonding, etc., A synthetic fiber material having a predetermined melting point such as polyester, nylon, polypropylene, polyethylene, polylactic acid, polyglycolic acid, polydioxanone, polycaprolactone, polyvinyl alcohol, Can be used.

The content of the binder fiber added in such a manner is not more than 40 parts by weight, preferably 5 to 40 parts by weight, more preferably 10 to 25 parts by weight, per 100 parts by weight of the total amount of the regenerated cellulose hollow fiber and the polyacrylic acid- . When the content of the binder fiber satisfies this range, it is possible to improve the morphological stability while improving the absorption rate retention ratio while reducing the absorption performance.

Also, according to an embodiment of the present invention, it can be manufactured by various methods such as wet (or sinking or super-knowledge), dry, spun lace and the like as described above. , Followed by thermal bonding, heat pressing or chemical bonding, and calendering steps after the composite nonwoven fabric for an absorber is prepared. By further carrying out these steps, it is possible to increase the strength and shape stability of the obtained composite nonwoven fabric for absorbers in a dry state or a liquid-absorbing state, and to improve the liquid-absorbent ratio retention ratio.

The hot pressing or calendering step may be carried out at a temperature of 0 to 200 ° C, or a temperature condition of 60 to 180 ° C, and a linear pressure of 20 to 250 kg / cm, or a pressure of 1 to 50 N / cm ² .

According to one embodiment of the present invention, a further gamma-ray irradiation step may be further performed for use as a medical fiber structure after the composite nonwoven fabric for an absorber is manufactured.

This gamma ray irradiation step has an effect of sterilizing the composite nonwoven fabric for absorbers directly applied to the skin without using heat or chemicals. In particular, the treatment by gamma irradiation can also be carried out with the composite nonwoven fabric for an absorber sealed as a final product. The gamma irradiation may be carried out at an irradiation dose of, for example, 5 to 30 kGy.

According to an aspect of the present invention, there is provided an absorber article having the aforementioned composite nonwoven fabric for an absorber. Such absorber articles may include adult incontinence pants / pads, diapers, sanitary napkins, food pads, food absorbent pads, animal sanitary pads, and the like.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the following examples. However, the embodiments according to the present invention can be modified into various other forms, and the scope of the present invention should not be construed as being limited to the following embodiments. Embodiments of the invention are provided to more fully describe the present invention to those skilled in the art.

Example 1

(Bramante, Kelheim fiber), and single yarn fineness of 10 dtex, fiber length of 52 mm, polyacrylic acid type superabsorbent fiber (Type 112/52/10, Technical Absorbents) were carded at a weight ratio of 90:10 in the honeycomb ratio and aligned on a net to form a web. The webs were laminated, and the laminated webs were needle punched at 90 / cm2 to prepare composite nonwoven fabrics for absorbers. At this time, the basis weight of the composite nonwoven fabric for absorber was 140.0 g / m 2. FIG. 1 shows an SEM photograph of the surface of the resultant composite nonwoven fabric for absorber, and FIG. 2 shows an SEM photograph of the viscose rayon hollow fiber obtained by observing the cross section during the absorption.

The viscose rayon hollow fiber had a hollow ratio of 57% at the time of wetting, which was obtained by immersing the hollow fiber in distilled water for 10 minutes, lyophilized, measuring the cross section in the radial direction using a scanning electron microscope (SEM) .

Example 2

A composite nonwoven fabric for absorbers was prepared in the same manner as in Example 1 except that viscose rayon hollow fibers and polyacrylic acid based superabsorbent fibers were mixed at a weight ratio of 80:20. The basis weight of the composite nonwoven fabric for the absorber was 137.5 g / m 2.

Example 3

A composite nonwoven fabric for absorbers was prepared in the same manner as in Example 1 except that viscose rayon hollow fibers and polyacrylic acid based superabsorbent fibers were mixed at a weight ratio of 70:30. The basis weight of the composite nonwoven fabric for the absorber was 139.3 g / m 2.

Example 4

A composite nonwoven fabric for absorbers was prepared in the same manner as in Example 1 except that viscose rayon hollow fibers and polyacrylic acid based superabsorbent fibers were mixed at a weight ratio of 60:40. The basis weight of the composite nonwoven fabric for the absorber was 309.7 g / m 2.

Example 5

A composite nonwoven fabric for absorbers was prepared in the same manner as in Example 1 except that viscose rayon hollow fibers and polyacrylic acid based superabsorbent fibers were mixed at a weight ratio of 50:50. The basis weight of the composite nonwoven fabric for the absorber was 243.2 g / m 2.

Example 6

A composite nonwoven fabric for an absorber was prepared in the same manner as in Example 1, except that the basis weight was 190.5 g / m 2.

Example 7

A composite nonwoven fabric for absorbers was prepared in the same manner as in Example 2, except that the basis weight was 186.0 g / m 2.

Example 8

A composite nonwoven fabric for absorbers was prepared in the same manner as in Example 3, except that the basis weight was 186.1 g / m 2.

Comparative Example 1

A nonwoven fabric was produced in the same manner as in Example 1 except that viscose rayon hollow fiber was used alone. The basis weight of the nonwoven fabric was 140.1 g / m 2.

Comparative Example 2

A composite nonwoven fabric for absorbers was prepared in the same manner as in Example 1, except that the basis weight was changed to 104.2 g / m 2.

Comparative Example 3

A composite nonwoven fabric for an absorber was prepared in the same manner as in Example 2 except that the basis weight was 96.2 g / m 2.

Comparative Example 4

A composite nonwoven fabric for an absorber was prepared in the same manner as in Example 3, except that the basis weight was changed to 100.8 g / m 2.

Experimental Example 1: Evaluation of Liquid Absorption Rate and Liquid Liquid Rate

The weight of the non-woven fabric prepared in Examples 1 to 8 and Comparative Examples 1 to 4 was measured in terms of the weight of the non-woven fabric by cutting the length to 5 cm * 5 cm,

After immersing in 0.9% physiological saline at 25 占 폚 for 10 minutes, the weight after the absorption was measured and calculated according to the following formula, and the results are shown in Table 1.

Absorption rate (g / c㎡ ) = [ Absorption Post Weight (g) - Absorption Total weight (g)] / [area of nonwoven fabric ( 25c㎡ )]

The non-woven fabric for absorbent article prepared in Examples 1 to 8 and Comparative Examples 1 to 4 was cut into a width of 5 cm * 5 cm and weight (before the liquid was absorbed) The weight of the nonwoven fabric (weight after pressing) was measured by applying a pressure of 40 mmHg (1,360 gf / 25 cm ² ) to the absorbed nonwoven fabric for one minute, and the weight was calculated by the following formula. Respectively.

(G / cm < 2 >) = [Weight after pressurization (g) - Weight before gluing (g)] /

Regenerated cellulose hollow fiber
(weight %) Polyacrylic acid-based superabsorbent fibers
(weight %) Basis weight
(g / m ² ) (G / cm < ² >) Moisture content
(g / cm ² ) Example 1 90 10 140.0 0.42 0.28 Example 2 80 20 137.5 0.45 0.33 Example 3 70 30 139.3 0.46 0.35 Example 4 60 40 309.7 0.69 0.58 Example 5 50 50 243.2 0.66 0.59 Example 6 90 10 190.5 0.54 0.36 Example 7 80 20 186.0 0.55 0.38 Example 8 70 30 186.1 0.57 0.43 Comparative Example 1 100 0 140.1 0.42 0.24 Comparative Example 2 90 10 104.2 0.36 0.24 Comparative Example 3 80 20 96.2 0.35 0.24 Comparative Example 4 70 30 100.8 0.36 0.26

Referring to Table 1, subjected to Examples 1 to 8 when the intake aekyul is 0.40 g / cm ² showed excellent liquid-absorbing properties get more, excellent beam aekyul high level to maintain the liquid-absorbing properties 0.25 g / cm ² or more, even after the pressure of the Respectively.

In Comparative Example 1, the liquid-absorbing rate was 0.42 g / cm ^{2, which} was comparatively excellent. However, the liquid-liquid ratio after pressurization was 0.24 g / cm ^2, which was lower than that in Examples. Comparative Examples 2 to 4 had low basis weights of not more than 120 g / cm ² , so that even when the polyacrylic acid-based superabsorbent fibers were mixed, the absorbency and liquidity were lower than those of Examples.

Experimental Example 2: Absorption rate at a pressure of 10 mmHg

When the pressure was applied, the nonwoven fabric prepared in Examples 1 to 8 and Comparative Example 1 was cut to a width of 5 cm * 5 cm, and the weight (before the liquid immersion) was measured. The nonwoven fabric was contacted with 0.9% physiological saline at 25 ° C for 10 minutes under a pressure of 10 mmHg (340 gf / 25 cm ² ), and the weight after absorbing under pressure was measured and calculated by the following equation And the results are shown in Table 2.

(G / cm 2) = [weight after absorbing under pressure of 10 mmHg (g) - weight before absorbing liquid (g)] / (area of nonwoven fabric (25 c㎡)

Experimental Example 3: Permeation rate retention

The absorbency retention was determined by cutting the nonwoven fabric prepared in Examples 1 to 8 and Comparative Example 1 to a width of 5 cm * 5 cm and measuring the weight (initial weight (weight before initial liquid absorption)).

After the weight of the nonwoven fabric was brought into contact with distilled water at 25 캜 for 10 minutes, the weight after the first absorbing liquid (weight after one absorbing liquid) was measured.

The absorbed nonwoven fabric was completely dried for 7 hours or more in a hot-air drier at 60 占 폚, and then the weight (absorbing weight after drying 1 time) was measured. The weight of the nonwoven fabric treated once with the absorbent-dried one-time was again contacted with distilled water at 25 ° C for 10 minutes, and the weight after the absorbing liquid (weight after two times of absorbing after 1 time of drying) was measured.

The absorbed nonwoven fabric was completely dried for more than 7 hours by a hot air drier at 60 ° C, and then the weight of the nonwoven fabric (weight after repeating absorption-drying twice) was measured. The weight of the nonwoven fabric, which was repeated twice, was again contacted with distilled water at 25 占 폚 for 10 minutes, and the weight after the absorption (weight after 3 times of absorption after 2 times of absorption and drying) was measured.

The weight of the liquid obtained by repeating the process of absorbing and drying after the above-described method, i.e., the liquid-absorbing-drying treatment was repeated five times, and the weight after the liquid-absorbing and drying five times and the weight after the liquid- .

The retention of free absorption was calculated by the following equations and the results are shown in Table 2. < tb > < TABLE >

(G / g) = initial weight (g) - initial weight (g) / initial weight (g)

Regenerated cellulose hollow fiber
(HVR)
(weight %) Polyacrylic acid-based superabsorbent fibers
(SAF)
(weight %) The adsorption rate at the pressurized state
(g / cm ² ) Absorption rate retention rate
(%) Example 1 90 10 0.22 90 Example 2 80 20 0.24 106 Example 3 70 30 0.26 104 Example 4 60 40 0.54 139 Example 5 50 50 0.53 125 Example 6 90 10 0.34 92 Example 7 80 20 0.32 103 Example 8 70 30 0.39 110 Comparative Example 1 100 0 0.19 78

The results are shown in Table 2. Referring to Table 2, the absorbency of 0.20 g / cm ² or more was observed even at a pressure of 10 mmHg in Examples 1 to 8, Was maintained. In particular, in Examples 2 to 5, in which 20% or more of the superabsorbent fibers were mixed, even after repeating the liquid-absorbing and drying processes five times, the liquid-absorbing ratio was excellent at 100% or more.

In the case of Comparative Example 1, the adsorption rate was 0.19 g / cm ² at a pressure of 10 mmHg, and the adsorption rate was lower than that of the Example. Even after 5 times of the absorption and drying processes, Of the total lipid content.

3 shows changes in the liquid absorption rate retention rate as the liquid absorption and drying process, that is, the number of times of repeated absorption and drying, was progressed once to five times for Example 2 and Comparative Example 1. FIG. At this time, the liquid absorbency after the liquid absorbing and drying 0 times corresponds to the initial liquid absorbency, so that the liquid absorbency retention ratio after 100 times of absorbing and drying is 0%.

Referring to FIG. 3, in Example 2, it was excellent to maintain the liquid-absorbing property even in the course of repeating the liquid-absorbing and drying, and even after the liquid-absorbing and drying was repeated five times, it was more than 100% in comparison with the initial liquid-absorbing rate. This is because the polyacrylic acid-based superabsorbent fibers swell when absorbed and widen the space between the fibers, and the space between the expanded fibers is maintained to a certain extent even after drying. On the contrary, in the case of Comparative Example 1, the absorption rate was drastically decreased as the absorption and drying were repeated, and after the absorption and drying processes were repeated five times, the poor absorption rate was maintained at less than 80% of the initial absorption rate. This is because when the regenerated cellulose hollow fiber is used alone, shrinkage occurs in the process of drying after the absorption, and the space between the fibers shrinks.

Claims

A regenerated cellulose hollow fiber and a polyacrylic acid-based superabsorbent fiber, having a basis weight of 120 g / m ² or more,
Wherein the weight ratio of the regenerated cellulose hollow fiber to the polyacrylic acid based superabsorbent fiber is 90:10 to 50:50.

delete

The method according to claim 1,
Wherein the regenerated cellulose hollow fiber has a hollow ratio of 30% or more when wetted, and the hollow ratio is calculated by the following formula.
Hollow ratio (%) = (total area of the hollow portion in the cross section of the hollow fiber) / (cross sectional area of the hollow fiber including the hollow) * 100

The method according to claim 1,
Wherein the polyacrylic acid based superabsorbent fiber has a liquid absorbency of not less than 10 g / g with respect to 0.9% physiological saline.

The method according to claim 1,
Wherein the composite nonwoven fabric for absorbers has a liquid absorbency of 0.40 g / cm < ² > or more with respect to 0.9% physiological saline.

The method according to claim 1,
Wherein the composite nonwoven fabric for absorber has a permeability of 0.25 g / cm < ² > or more after pressurization of 40 mmHg after absorbing 0.9% physiological saline.

The method according to claim 1,
Wherein the composite nonwoven fabric for absorbers has a liquid absorbency of 0.20 g / cm < ² > or more with respect to 0.9% physiological saline under a pressure of 10 mmHg.

The method according to claim 1,
Wherein the absorptive percentage retention ratio of the composite nonwoven fabric for absorber is 85% or more, and the absorptivity retention ratio is calculated as follows.
Liquid absorption rate retention rate (%) = (absorption rate after 5 times of absorption = drying) / (initial liquid absorption rate) * 100
(G / g) = initial weight (g) - initial weight (g) / initial weight (g)
(G / g) = [weight after absorbing 5 times of absorbing liquid 5 times after absorbing liquid 5 times (g) absorbing liquid 5 times of weight after drying 5 times / Weight (g)]

The method according to claim 1,
Wherein the composite nonwoven fabric for absorbers further comprises binder fibers of up to 40 parts by weight based on 100 parts by weight of the total of regenerated cellulose hollow fibers and polyacrylic acid based superabsorbent fibers.

10. An absorbent article comprising the composite nonwoven fabric for an absorbent body according to any one of claims 1 to 9.