JP2002263136A - Sheet-like high absorbent and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the adding ratio of MFC (micro-fibrillated cellulose) to a small amount without damaging the dispersibility of coating liquid and the fixing strength of SAP (sheet-like absorbent polymer) and a supporting body and to provide a sheet-like high absorbent with excellent water absorptivi ty and comfortable touch feeling. SOLUTION: By using the MFC having certain specified viscosity, the ratio of the MFC to the SAP contained in an absorption layer is reduced and the water absorptivity, the touch feeling and productivity are improved while maintaining the dispersibility of the coating liquid and the fixation of the SAP to a sheet-like base material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
"SAP") as its binder and dispersant, microfibrillated cellulose (hereinafter "MFC")
The present invention relates to a sheet-like high-absorbent body fixed to a sheet-like support using the above. This sheet-like high-absorbent material is widely used for absorbent products such as diapers for infants and adults, feminine hygiene products, water-stop tapes, water-stop materials, and medical blood-absorbent materials as well as ordinary high water-absorbent materials. Available.

[0002]

2. Description of the Related Art Absorbents used in absorbent products for absorbing water and body fluid have conventionally been composed of a combination of fluffy wood pulp and SAP. However, in recent years, there has been a great social demand for thinner and more compact absorber products, which have been relatively bulky, in order to improve logistics efficiency, improve shelf efficiency at retail stores, and save resources. Has become.

[0003] As a means for reducing the size and thickness of an absorber using fluff wood pulp and SAP, there is a method of increasing the ratio of SAP to fluff wood pulp. If the ratio of the SAP having a high liquid absorbing capacity is increased, the thickness of the absorber becomes thinner. Ultimately, if the SAP has a 100% structure, the absorber can be made as thin as possible. However, when the ratio of the SAP is increased, “gel blocking” based on the properties of the SAP occurs, and the efficiency of liquid absorbency (hereinafter, referred to as “absorbency”) deteriorates. This “gel blocking” refers to SAP
Is present on the surface when the absorber containing
P absorbs the liquid and swells, so that the SA inside
A phenomenon in which P cannot absorb liquid. When this "gel blocking" occurs, only the surface layer SAP can absorb the liquid, and the absorbability is extremely reduced. In addition, when the ratio of SAP becomes high, it becomes impossible to fix the SAP to the support, and there is a problem that the SAP falls off from the absorbent, and the SAP which has absorbed the liquid and swells out of the absorbent. appear.

In order to increase the ratio of SAP and to obtain a bonding strength between the SAP and the support that can be used, a method disclosed in Japanese Patent Application Laid-Open
Japanese Patent Application Laid-Open No. 7-181193 proposes a method in which SAP is softened with water and then fixed to a support. Also, JP-A-54-141099, JP-A-58-1010
No. 47 proposes a method in which an SAP is sandwiched between supports and the SAP is fixed to the support using water or steam. However, these methods cannot solve problems such as the SAP protruding from the absorber when the SAP absorbs the liquid and swells. Further, occurrence of “gel blocking” is remarkable, and water absorption is extremely low.

Japanese Patent Application Laid-Open No. Sho 60-149609 proposes a method in which a support is impregnated with a monomer of an absorber, followed by polymerization and crosslinking. However, this method does not provide sufficient absorption.

As a method for solving such a problem associated with increasing the SAP ratio, Japanese Patent Laid-Open No. 10-168 discloses a method.
No. 230 proposes a method using MFC. In the present invention, SAP and MFC are dispersed in an alcohol / water mixed dispersion medium, coated on a sheet-like support,
Then, after the liquid is removed, the sheet-like superabsorbent is manufactured by drying. At this time, the MFC plays a role of improving the dispersibility of the coating liquid and fixing the SAP to the sheet-like support. Compared to fluff wood pulp, MFC has a much higher strength for fixing SAP to a sheet-like support.
The amount added to P can be reduced, and the absorber can be made thinner. Further, since the MFC is densified by drying, the density is significantly higher than fluff wood pulp. This also contributes to making the absorber thinner. Further, by using MFC, SA
There is an effect of securing an appropriate space around P and preventing gel blocking.

[0007]

However, when a sheet-like high-absorbent material is industrially manufactured using MFC and SAP by the above method, the absorber becomes stiff like paper due to the influence of MFC. The tactile sensation when used in diapers, sanitary products, and the like is deteriorated. In addition, the surface of the SAP is covered with the MFC, and the absorptivity is reduced. Further, in the manufacturing process, the dewatering property at the time of dewatering deteriorates. Further, the addition of MFC, which requires a large amount of energy for its production, is disadvantageous from the viewpoint of economy. From the above, the amount of MFC added needs to be as small as possible.

However, Japanese Patent Application Laid-Open No. H10-168230
Even if S-MFC (super microfibrillated cellulose) or BC (bacterial cellulose), which is optimized in Japanese Patent Publication The settling of the SAP occurs in the solution, and the concentration of the coating solution changes at the beginning and end of the coating, resulting in a change in the coating amount. Further, since the bonding strength is not sufficient, SAP may fall off during the manufacturing process or during the subsequent processing process. For this reason,
With the prior art, it was not possible to produce an absorber having excellent absorbency and tactile sensation.

Therefore, the present invention relates to a method for dispersing a coating liquid,
An object of the present invention is to obtain a sheet-like high-absorbent material having excellent absorption and tactile sensation, while keeping the addition ratio of MFC to a small amount without impairing the fixing strength between P and the support.

[0010]

Means for Solving the Problems The present inventors have studied the viscosity of a dispersion liquid when MFC is dispersed in an alcohol / water mixed dispersion medium (hereinafter referred to as “MFC viscosity”) and the alcohol / water mixed medium. The dispersibility of the coating liquid in which MFC / SAP is dispersed (hereinafter referred to as “dispersibility of the coating liquid”) and the bond strength between the SAP and the support when the coating liquid is coated on a sheet-like support (hereinafter, “ (Referred to as "fixing strength"). In addition, it has been found that the dispersibility and the fixing strength of the coating liquid can be drastically improved by using an MFC having a specific viscosity. Furthermore, if the MFC having this specific viscosity is used, even if the addition ratio of the MFC to the SAP is reduced, the difference between the application amount at the beginning and the end of the coating process can be eliminated, and The present inventors have found that it is possible to obtain a sheet-like absorber that does not cause the SAP to fall off during or after the processing step, and have reached the present invention.

That is, according to the present invention, when dispersed in a dispersion medium having a weight ratio of alcohol / water of 7/3 at a concentration of 0.5%, the viscosity measured with a B-type viscometer (60 rpm) is 100%.
By using the fine fibrillated cellulose having a cps or more, the dispersibility and the fixing strength of the coating liquid are remarkably improved, and the weight ratio of the fine fibrillated cellulose / polymer absorbent in the absorbing layer is 1.5 / 98. It is a sheet-shaped absorber excellent in water absorption and tactile sensation of 0.5 to 3/97.

The present invention also relates to a method for dispersing alcohol / water at a concentration of 0.5% in a dispersion medium having a weight ratio of 7/3.
The viscosity measured with a B-type viscometer (60 rpm) is 200 cp.
s or more, the dispersibility and the fixing strength of the coating liquid are remarkably improved, and the weight ratio of the fine fibrillated cellulose / polymer absorbent in the absorbing layer is 0.1 / 99. It is a sheet-shaped absorber excellent in water absorbency and tactile sensation of from 0.9 to 1.5 / 98.5.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The sheet-like superabsorbent material of the present invention reduces the ratio of MFC to SAP contained in an absorbent layer by using MFC having a specific viscosity, thereby improving the dispersibility of a coating liquid. This is an improvement in water absorption, tactile sensation, and productivity without impairing the fixation of the SAP to the sheet-like substrate. How much the MFC ratio can be reduced is determined by the viscosity of the MFC.

The viscosity of the MFC needs to be measured with a dispersion medium having a weight ratio of alcohol / water of 7/3 which is close to the dispersion medium at the time of actual application. This is because there is a difference in the microfibril network structure of the MFC between the case where the dispersion medium for dispersing the MFC is only water and the case where the dispersion medium contains alcohol.

In the production of a sheet-shaped superabsorbent, MFC
As a dispersion medium for dispersing SAP and SAP, a mixed medium of alcohol and water is used in order to suppress SAP from swelling in the dispersion medium. At this time, if the proportion of the alcohol is too high, not only is the dispersion medium expensive, but also prevents the microfibrils from taking a network structure, dispersing the coating liquid, and fixing the SAP to the sheet-like substrate. Make it worse. This is because the microfibrils hydrogen bond with each other via water to form a network, and a sufficient network is not formed unless water is sufficient. Conversely, if the proportion of water is too high, the SAP absorbs water and swells in the dispersion medium, and the viscosity increases rapidly, making it impossible to apply.
Even if the coating can be performed, it is very difficult to dry the SAP that has absorbed water to an appropriate moisture in the drying step, and the productivity is very poor. For this reason, the dispersion medium balances the ratio of water and alcohol so that the above-mentioned problem does not occur. A commonly used dispersion medium is alcohol /
The weight ratio of water is 7/3. For this reason, the viscosity of the MFC needs to be measured using a dispersion medium having a weight ratio of alcohol / water of 7/3. The viscosity was measured using a B-type viscometer (60 rpm).
m).

The sheet-like superabsorbent material of the present invention has an M
The weight ratio of FC / SAP is 1.5 / 98.5 to 3/97, and the viscosity of MFC measured by the above method is 100.
It must be at least cps. If the weight ratio of MFC / SAP is more than 3/97, the dispersibility and the fixing strength are improved, but the paper becomes stiff, and the feel when used in diapers, sanitary products, etc. is deteriorated. I will. Also, SA
The amount of coating on the surface of P becomes too large, and the water absorption is reduced. Further, in the production process, the liquid removal property at the time of liquid removal is deteriorated, and the amount of MFC that requires a large amount of energy for the production is increased, which is very disadvantageous in terms of economy. The weight ratio of MFC / SAP is 1.5 /
When the viscosity is less than 98.5, even if the viscosity of the MFC is 100 cps or more, good dispersibility of the coating liquid and adhesion of the sheet-like substrate cannot be obtained.

When the viscosity of the MFC is less than 100 cps,
In order to obtain good coating liquid dispersibility and fixing strength, MF
It is necessary to make the weight ratio of C / SAP larger than 3/97, and the above-mentioned tactile sensation, water absorption, productivity, etc. are deteriorated. In other words, to reduce the ratio of MFC to SAP,
It is necessary to use an MFC having a viscosity of 100 cps or more.

The reason why the viscosity greatly affects the dispersibility and the fixing strength of the coating liquid is presumed as follows. The properties necessary for the dispersibility and the fixing strength of the coating liquid are related to the degree of fibrillation rather than the factor relating to the fiber length of the MFC. For example, S-MF having a number average fiber length of 0.1 mm or less is used.
Even if it is called C, if the degree of fibrillation is low, sufficient dispersibility and fixing strength cannot be obtained, and conversely, even if the number average fiber length is longer than 0.1 mm, If the degree is high, good dispersibility and adhesion strength can be obtained.

MF having a high degree of fibrillation
C shows a high value in viscosity. The highly fibrillated MFC has a large specific surface area and therefore has many hydration points, thereby increasing the viscosity and exhibiting good dispersibility.
Further, since the specific surface area is large, the ability to form a hydrogen bond is high, and the bonding strength is also improved. In addition, since the microfibrils are in a highly branched state, it is easy to structurally hold the SAP. From the above, it is understood that there is a strong correlation between the dispersibility and the viscosity, and between the fixing strength and the viscosity.

Water retention is an indicator of the degree of fibrillation, and water retention is usually measured in a water-only system. For this reason, fibrillation of MFC in an alcohol / water dispersion medium is not accurately represented. In actual production, since MFC and SAP are dispersed in an alcohol / water dispersion medium, the state of fibrillation of MFC in an actual coating liquid cannot be measured by the water retention. In particular, the dispersibility of the coating liquid has a stronger correlation with viscosity than with water retention.

If the viscosity of MFC is set to 200 cps or more, the weight ratio of MFC / SAP is 0.1 / 99.9 to 1.
5 / 98.5. Thus, M
Increase the viscosity of FC to 200 cps or more, and
Reducing the addition ratio of FC is very advantageous in terms of feel and water absorption. At this time, if the viscosity of the MFC is 200 cps or more, it is possible to obtain a sheet-like high-absorbent material in which the amount of application is constant and the SAP does not fall off even if the ratio of the MFC is used. However, the viscosity of MFC is 200 cps
In order to achieve the above, manufacturing the MFC is costly and disadvantageous economically. Further, the viscosity of the coating liquid increases, and the coating aptitude decreases as compared with the case where the viscosity of the MFC is 100 or more and less than 200 cps.

The viscosity of the MFC and the proportion of the MFC added to the SAP affect the water absorption of the superabsorbent sheet, the dispersibility of the coating liquid, and the productivity. The viscosity of the MFC and the proportion of the MFC added to the SAP can be freely selected within the scope of the present invention depending on the use of the sheet-shaped superabsorbent.

The MFC used in the present invention can be obtained by subjecting cellulose or a cellulose derivative to a fine treatment. As a raw material, any fibrous cellulose such as hardwood, softwood, non-wood, and regenerated cellulose can be used.

As for the method of miniaturization, many methods for miniaturization by applying a strong mechanical shearing force to cellulose fibers have been proposed. For example, JP-A-7-31
No. 0296 proposes a method in which a cellulose fiber slurry that has been beaten in advance is made finer by passing it through a rubbing portion of a rubbing device for an abrasive plate. In Japanese Patent Publication No. 60-19921, a cutting action is performed by passing a slurry of fibrous cellulose through a small-diameter orifice to give a high speed to the slurry, and then colliding the slurry to rapidly reduce the speed. Has proposed a method for miniaturization. Further, Japanese Unexamined Patent Application Publication No.
In No. 0286, glass, alumina, zirconia, zircon, steel, a vibration mill pulverizer using beads or balls of a material such as titania as a pulverizing medium,
A method of making a slurry of fibrous cellulose finer has been proposed. Microfibrillated cellulose can also be obtained by microbial metabolism. Generally, A
So-called acetic acid bacteria, such as cetobactor Xylinum, are cultured with stirring in a medium containing a suitable carbon source to produce crude microfibrils, which are then purified. This fine fibrillated cellulose is called BC (bacterial cellulose). Further, fine fibrils obtained by coagulating a copper ammonia solution, an amine oxide solution, an aqueous solution of cellulose xanthate, or an acetone solution of diacetyl cellulose of spinnable cellulose under shearing stress, and further so-called fibril-like material are further disaggregated. Cellulose-like material can be obtained.

The above-mentioned various fine fibrillated celluloses and fine fibrillated cellulose-like materials are all included in the “MFC” described in the present invention.

Among them, a method of pulverizing a pulp slurry that has been beaten in advance with an abrasive plate rubbing apparatus is particularly useful because a highly fibrillated MFC can be efficiently obtained.

The SAP used in the present invention is a polymer having an ability to absorb and retain a liquid several to several hundred times its own weight without being dissolved in the liquid. These SAPs include natural polymers such as starch and cellulose, copolymers of acrylic acid, styrene sulfonic acid, etc. polymerized and bonded, synthetic polymers such as polyvinyl alcohol and polyacrylate, and cross-linked. There are polyethylene glycol-based polymers and the like, which can be used alone or in combination. The shape of the SAP is powdery,
There are flakes, small blocks, fibers, sheets, films, laminates, etc., all of which can be used in the present invention, but powders that can be dispersed in a mixed medium of alcohol / water Flakes and small blocks are preferred.

When SAP absorbs and swells with water, its dispersion becomes very high in viscosity, loses fluidity, and becomes difficult to handle. Therefore, the dispersion medium for dispersing the SAP is SAP
Should not swell too much. Also, M
Since water is required to develop hydrogen bonding of FC, a mixed medium of water and a dispersion medium compatible with water is used. As described above, alcohols such as methyl alcohol, ethyl alcohol, and isopropyl alcohol are preferably used as a dispersion medium that does not greatly swell the SAP and is compatible with water.

As the sheet-like support, non-woven fabric, woven fabric, paper and the like can be used, but any material can be used as long as it can form a coating layer on a sheet, and can drain and dry. can do. As a material, it is desirable to use a hydrophilic material such as cotton, rayon, wood pulp or the like, or a material obtained by subjecting a synthetic fiber such as polyethylene, polypropylene, polyester or the like to hydrophilicity treatment from the problem of liquid permeability. In particular, MFC has a very strong hydrogen bonding property in addition to physical confounding. Therefore, when a cellulosic base material is used, it is more stably bonded when dried.

The absorbent layer of the present invention contains MFC and SAP as main components, but if necessary, other fibers and chemicals can be added as long as the performance is not impaired. As the fibers, for example, natural fibers such as wood fibers and non-wood fibers, chemical fibers such as rayon, regenerated fibers such as lyocell, semi-synthetic fibers such as acetate, and synthetic fibers such as acrylic fibers and polypropylene fibers can be added. These fibers are disadvantageous in terms of thinning the sheet-like superabsorbent, but may be advantageous in terms of softening the feel and guiding water to the SAP by capillary action. Therefore, these fibers can be appropriately used depending on the use of the sheet-shaped superabsorbent. As the chemical, for example, functional chemicals such as an antibacterial agent, a deodorant, a fungicide, a binder, a dye, a pigment and the like can be used. These chemicals can also be used as appropriate depending on the use of the sheet-shaped superabsorbent.

As a method for producing a sheet-shaped superabsorbent, a method in which SAP and MFC are dispersed in an alcohol / water mixed dispersion medium, coated on a sheet-shaped support, dewatered, and dried. There is. At this time, M
FC plays a role of improving the dispersibility of the coating liquid and fixing the SAP to the sheet-like support. At this time, the alcohol / water dispersion medium preferably has a weight ratio of alcohol / water of 8/2 to 6/4. SAP and MFC
Is different depending on SAP and MFC.
It is preferable to disperse such that the solid content concentration becomes approximately 10 to 40%.

As a method for applying the SAP onto the sheet-like support, any method can be used as long as it can form a coating layer of a coating solution in which MFC / SAP is dispersed on the support. In particular, a method in which coating is performed by overflowing from a nozzle provided at the top of a closed container as in the method described in JP-A-2000-229259 can be preferably used.

[0033]

EXAMPLES Specific examples of the present invention will be described below.

Example 1 NBKP was beaten with a beater to 300 m
After refining to less than 1 l, use an abrasive grain rubbing device (Masuyuki Sangyo Co., Ltd., trade name "Super Grindel")
When the dispersion was dispersed at a 0.5% concentration in a mixed medium having a weight ratio of ethyl alcohol / water of 7/3 at a concentration of 0.5%, the viscosity of the dispersion measured by a B-type viscometer (60 rpm) was 150 cps, and the number average fiber length was 0. MFC created to be 0.08mm
And SAP (Mitsubishi Chemical Corporation, trade name "Aqua Pearl A
P-211D ") with a weight ratio of MFC / SAP of 2/9.
No. 8, a method of dispersing in a mixed dispersion medium having a weight ratio of ethyl alcohol / water of 7/3 at a solid content concentration of 20%, and applying a coating by overflowing from a nozzle provided at the top of the closed container, Kuraray, rayon / P
ET two-layer web, 40 g / m ² )
Then, after dewatering, by drying, the width is 500 m.
m, and a sheet-like superabsorbent having a length of 1000 m was produced.

Example 2 In the same manner as in Example 1, an MFC having a viscosity of 100 cps and a number average fiber length of 0.08 mm was used, and the weight ratio of MFC / SAP was adjusted to 1.5 / 98.5. .

Example 3 An MFC having a viscosity of 120 cps and a number average fiber length of 0.14 mm was prepared in the same manner as in Example 1, and the weight ratio of MFC / SAP was 2/98.

Example 4 An MFC having a viscosity of 200 cps and a number average fiber length of 0.09 mm was manufactured in the same manner as in Example 1, with a weight ratio of MFC / SAP of 0.1 / 99.9. .

Example 5 An MFC having a viscosity of 230 cps and a number average fiber length of 0.09 mm was produced in the same manner as in Example 1, except that the weight ratio of MFC / SAP was 1/99.

Example 6 An MFC having a viscosity of 150 cps and a number average fiber length of 0.08 mm was used in the same manner as in Example 1, and the weight ratio of MFC / SAP was 3/97.

Example 7 In the same manner as in Example 1, an MFC having a viscosity of 200 cps and a number average fiber length of 0.08 mm was used, and the weight ratio of MFC / SAP was 1.5 / 98.5. .

Comparative Example 1 An MFC having a viscosity of 150 cps and a number average fiber length of 0.08 mm was used in the same manner as in Example 1, and the weight ratio of MFC / SAP was 5/95.

Comparative Example 2 An MFC having a viscosity of 80 cps and a number average fiber length of 0.08 mm was used in the same manner as in Example 1, and the weight ratio of MFC / SAP was 2/98.

Comparative Example 3 An MFC having a viscosity of 150 cps and a number average fiber length of 0.09 mm was produced in the same manner as in Example 1, except that the weight ratio of MFC / SAP was 1/99. All the MFCs used in Examples other than Example 2 were S-MFC
It is. [Comparison of decrease in coating amount of manufactured sheet-shaped superabsorbent] The average applied amount of absolutely dried was measured at 1000 m in the longitudinal direction, 1 m at the beginning of coating and 1 m at the end of coating of the manufactured sheeted superabsorbent. Reduction rate of applied amount at the end of coating relative to applied amount at the beginning of the process
/ Amount of coating at the beginning of coating) × 100 (%)).

[Comparison of the amount of SAP falling off during the manufacturing process]
During the manufacturing process, SAP falls off mainly when the coating surface is in contact with the rolls of the production line.
The weight of the SAP adhered during the application of 000 m was compared as a representative value.

[Evaluation of Stiffness] The stiffness of the manufactured sheet-like superabsorbent material was evaluated by touch. Soft and easily deformable → ○ Rigid and rugged → × [Evaluation of water absorption] Place a 10 cm × 10 cm sheet-shaped high-absorbent body flat, and place 250 ml of ion-exchanged water at the center at 7 ml / sec. The state when pouring at a high speed was observed. All of the ion-exchanged water that was poured was absorbed → ○ It could not be completely absorbed and ion-exchanged water flowed out of the sheet → ×

[0046]

【table 1】

From the above results, in Comparative Example 1 in which the amount of MFC added was large in the ratio of MFC / SAP, the sheet was stiff and rough, and the water absorption was reduced. When the weight ratio of MFC / SAP was 2/98, when Example 1 and Comparative Example 2 were compared, the viscosity was 150 c even though S-MFC having the same average fiber length was used.
It can be seen that only in Example 1 using the MFC of ps, the reduction rate of the coating amount and the amount of the SAP adhered to the roll were significantly suppressed. Even when the MFC used as in Example 3 has a long fiber length (that is, not S-MFC), it shows high viscosity, so that a good coating material can be obtained with a reduced coating amount and SAP falling off. Was. The same applies when the weight ratio of MFC / SAP is 1/99, and the viscosity is 230 cp.
In Example 5 using the MFC of Example s, the decrease in the amount of application and the amount of SAP falling off were significantly suppressed as compared with Comparative Example 3.

[0048]

As can be seen from the above, MFC /
In the case where the weight ratio of SAP is 1.5 / 98.5 to 3/97 to produce a sheet-like superabsorbent, a coating liquid in which the weight ratio of alcohol / water is 7/3 and dispersed at a concentration of 0.5%. When the MFC having a viscosity of 100 cps or more is used, a sheet-like high-absorbent material having good dispersibility and fixing strength, a substantially constant application amount at the beginning and end of coating, and almost no SAP falling off can be obtained. . When the weight ratio of MFC / SAP is 0.1 / 99.9 to 1.5 / 98.5,
When an MFC having a viscosity of 200 cps or more is used, it is possible to obtain a material without a change in the coating amount and without SAP falling off.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B029 BA15 BA17 4C003 AA25 GA02 4C098 AA09 CC01 DD05 DD06 DD10 DD25 DD27 4G066 AC02B AC12B AC13C AC14B AC17B AD01B AE05B BA03 BA16 BA38 CA43 DA11 EA05 EA20 FA37 FA40

Claims (4)

[Claims] 1. A sheet-like superabsorbent having an absorbent layer mainly composed of microfibrillated cellulose and a polymer absorbent, wherein the weight ratio of the microfibrillated cellulose / polymer absorbent in the absorbent layer is 1.5 / 98.5-3 / 97,
In addition, when the fine fibrillated cellulose is dispersed at a concentration of 0.5% in a dispersion medium having an alcohol / water weight ratio of 7/3, the viscosity measured by a B-type viscometer (60 rpm) is 100 cps or more. A sheet-like high-absorber characterized by the above. 2. In a sheet-like superabsorbent material having an absorbent layer mainly composed of fine fibrillated cellulose and a polymer absorbent, the weight ratio of the fine fibrillated cellulose / polymer absorbent in the absorbent layer is 0.1 /. 99.9-1.5 / 98.5
And the fine fibrillated cellulose has a concentration of 0.5 in a dispersion medium having a weight ratio of alcohol / water of 7/3.
%, When dispersed in%, the viscosity measured by a B-type viscometer (60 rpm) is 200 cps or more. 3. A B-type viscometer (6%) when dispersed at a concentration of 0.5% in a dispersion medium having a weight ratio of alcohol / water of 7/3.
A fine fibrillated cellulose having a viscosity of 100 cps or more measured at 0 rpm) and a polymer absorber are dispersed in a dispersion medium having a weight ratio of alcohol / water of 7/3, and this dispersion is coated on a support. A method for producing a sheet-like superabsorbent body, which comprises removing liquid and then drying to produce a sheet-like superabsorbent body. 4. The method for producing a sheet-like superabsorbent according to claim 3, wherein the weight ratio of the fine fibrillated cellulose / polymer absorbent is 1.5 / 98.5 to 3/97. .