JPH0726151A - Water-absorbing agent composition and its production - Google Patents

Abstract

PURPOSE:To obtain a water-absorbing agent composition having improved gel strength and absorption ratio and useful for sanitary material, etc., by mixing a specific water-absorbing resin with a specific fluorine-containing compound. CONSTITUTION:This composition is produced by mixing (A) a water-absorbing resin capable of absorbing >=10g/g of physiological saline water with (B) a fluorine-containing compound having the structural unit of the formula (n is integer of >=1; m is 0 or >=1; n>=m). Preferably, the amount of the component B is 0.001-10 pts.wt. based on 100 pts.wt. of the component A, the mixing is carried out in the presence of <=50 pts.wt. of water based on 100 pts.wt. of the component A, the component A contains carboxyl group and/or its alkali metal salt and the component B is cationic or nonionic surfactant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water absorbent composition having an excellent absorption capacity and improved gel strength, and a method for producing the same.

[0002]

2. Description of the Related Art In recent years,
A water-absorbent resin that absorbs tens to thousands of times its own weight of water has been developed, and as a water-absorbing agent for sanitary items, disposable paper diapers, etc.
It is also used as a water retention agent for agriculture and horticulture, a solidifying agent for sludge, a dew condensation preventing agent for building materials, a water blocking agent for civil engineering, a dehydrating agent for solvents, and the like.

Examples of water-absorbent resins of this type include starch-acrylonitrile graft copolymer hydrolysates, polyacrylic acid (salt) crosslinked products, acrylic acid (salt) -vinyl alcohol copolymers, carboxymethylcellulose crosslinked products, and polyethylene. Oxide cross-linked products are known, but in any case, the absorption capacity is low, or even if the absorption capacity is high, the gel strength after water absorption is weak, or the gel after water absorption becomes sticky. It has drawbacks such as

In general, a water-absorbent resin can have its absorption capacity increased and its gel strength after water absorption increased by controlling its crosslinking density.

However, if the cross-linking density is increased to increase the gel strength, the absorption capacity decreases, so that the gel strength and the absorption capacity cannot be compatible at a high level. As a method of obtaining a high gel strength without reducing the absorption capacity so much, for example, a method of forming secondary crosslinks on the surface of the water-absorbent resin particles has been proposed (Japanese Patent Publication No. 59-6696, Japanese Patent Publication No. 60-60). 18690, Japanese special public Sho6
1-448521). However, although the above method can reduce the decrease in absorption capacity, the decrease in absorption capacity is unavoidable in order to obtain sufficient gel strength.

An object of the present invention is to provide a water absorbing agent having improved gel strength without lowering the absorption capacity and a method for producing the same.

[0007]

Means for Solving the Problems As a result of intensive studies conducted by the present inventors in view of the above problems, the absorption capacity of physiological saline was 1
Water-absorbent resin of 0 g / g or more and the following general formula (I)

[0008]

[Chemical 3]

(Wherein n is an integer of 1 or more, m is 0 or an integer of 1 or more, and n ≧ m), and the fluorine-containing compound (I) is contained in the absorbent. The present inventors have found that the composition has improved gel strength and an absorption capacity higher than that of the water-absorbent resin before the incorporation of the fluorine-containing compound (I), and completed the present invention.

The water-absorbent resin used in the present invention absorbs an aqueous liquid and swells, and exhibits an absorption capacity of 10 g / g or more for physiological saline. Absorption capacity of physiological saline is 10g /
A water-absorbent resin of less than g has insufficient ability as a water-absorbent resin.

The water-absorbent resin used in the present invention is generally obtained by polymerizing a water-soluble unsaturated monomer. Examples of such water-soluble unsaturated monomers include acrylic acid, methacrylic acid, maleic acid, fumaric acid, crotonic acid, itaconic acid, vinylbenzenesulfonic acid, 2
-(Meth) acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2
-(Meth) acryloyl propane sulfonic acid, and their alkali metal salts, ammonium salts, amine salts and the like can be mentioned, and at least one selected from these groups can be used. Among them, those having a carboxyl group and / or an alkali metal salt thereof are preferable, and acrylic acid (salt) is preferably used as a main component from the viewpoint of performance and cost of the water absorbent resin to be obtained.

The amount of carboxyl groups contained in the water-absorbent resin used in the present invention is not particularly limited, but the amount of carboxyl groups and salts thereof is 0.01 per weight of the water-absorbent resin.
It is preferably present in an equivalent amount or more, and the ratio of the unneutralized portion is preferably 1 to 50 mol% from the viewpoint of absorption performance. In addition, a graft bond or a complex may be formed simultaneously with the polymerization by polymerizing the above-mentioned monomer component in the presence of a hydrophilic polymer such as starch, cellulose or polyvinyl alcohol.

The water-absorbent resin according to the present invention has a crosslinked structure, and even if it is a self-crosslinking type resin obtained without using a crosslinking agent, it has a polymerizable unsaturated group and / or a reactive functional group. It may be obtained by using a crosslinking agent having

Examples of these cross-linking agents include N,
N'-methylenebis (meth) acrylamide, (poly)
Ethylene glycol di (meth) acrylate, glycerin tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, triallylamine, triallyl cyanurate, triallyl isocyanurate, glycidyl (meth) acrylate, (poly) ethylene glycol, diethylene glycol , (Poly) glycerin, propylene glycol, diethanolamine, trimethylolpropane, pentaerythritol, (poly) ethylene glycol diglycidyl ether, (poly) glycerol polyglycidyl ether, epichlorohydrin, ethylenediamine, polyethyleneimine, (poly) aluminum chloride, aluminum sulfate , Calcium chloride, magnesium sulfate, and the like. Of these, one type or two or more types can be used in consideration of reactivity.

The polymerization method is not particularly limited. Any conventionally known method or aqueous solution polymerization and reverse phase suspension polymerization may be used.

The shape of the water-absorbent resin used in the present invention is not particularly limited as long as it is powder or powder, and it is spherical, scaly,
Any of a crushed amorphous shape and a granular shape may be used.

The fluorine-containing compound (I) used in the present invention is
There is no particular limitation as long as it has the structural unit represented by the general formula (I). Here, the structural unit represented by the general formula (I) is as described above, but when m is larger than n in the general formula (I), the gel strength is insufficiently improved. In order to make the features of the present invention more prominent, n is 2 to 3
0, particularly 3 to 20, and m is preferably 0 or in the range of 1 to 30. When n is less than 2, the gel strength is insufficiently improved, and when n exceeds 30, it may be difficult to form a uniform composition with the water absorbent resin. Among the structural units represented by the general formula (I), a structural unit in which m is 0, that is, the following general formula (II)

[0018]

[Chemical 4]

The structural unit represented by (where n is an integer of 1 or more) is preferable because the effect is particularly remarkable. A structural unit in which a plurality of structural units represented by the general formula (I) are bonded via an oxygen atom, that is, the following general formula (II
I)

[0020]

[Chemical 5]

(Where x is an integer of 1 to 4, y is 0 or an integer of 1 to 4, z is an integer of 1 to 30 and x ≧ y). Can also be used as the fluorine-containing compound (I).

These fluorine-containing compounds (I) are preferably compounds having a surfactant or a group capable of reacting with the functional group of the water absorbent resin. The term "surfactant" as used herein means a group having an amphipathic structure and having different solubility tendencies, for example, an oil-soluble (fluoro) hydrocarbon group and a water-soluble ionic or polar group as typical ones. In addition, the surface tension is greatly reduced by adding an extremely small amount to water. Especially when the aqueous solution has a critical micelle concentration, its surface tension (25 ° C.) is 50 dy.
Those that can be set to n / cm or less are preferable.

Examples of such a fluorine-containing compound (I) include fluoroalkyl (C ₂ -C ₁₀ ) carboxylic acid N-perfluorooctanesulfonylglutamate disodium and 3- [fluoroalkyl (C ₆ -C ₁₁ ) oxy. ] -1-Alkyl (C ₃ -C ₄ ) sodium sulfonate,
Sodium 3- [ω-fluoroalkanoyl (C ₆ -C ₈ ) -N-ethylamino] -1-propanesulfonate, N
- [3- (perfluorooctane sulfonamide) propyl] -N, N-dimethyl -N- carboxymethylene ammonium betaine, fluoroalkyl (C ₁₁ -C ₂₀₎
Carboxylic acid, perfluoroalkyl carboxylic acids (C ₇ ~
C _13), perfluorooctane sulfonic acid diethanolamide, perfluoroalkyl (C ₄ -C ₁₂₎ sulfonate (Li, K, Na), N-propyl-N-(2-hydroxyethyl) perfluorooctane sulfonamide , Perfluoroalkyl (C ₆ -C ₁₀ ) sulfonamidopropyltrimethylammonium salt, perfluoroalkyl (C ₆ -C ₁₀ ) -N-ethylsulfonylglycine salt (K), bis (N-perfluorooctylsulfonyl phosphate) -N-ethylaminoethyl), monoperfluoroalkyl (C ₆ -C ₁₆ ) ethyl phosphate ester and other fluorine-based surfactants, 6- (perfluoro-5-methylhexyl) hexanol, 1H, 1H, 5H-octa Fluoropentanol, 1H, 1H, 7H-dodecafluoropentanol, etc. Containing alcohol, 3-perfluorohexyl-1,2-epoxypropane, 3- (perfluoro-9-methyldecyl) -1,2 can be mentioned epoxy compounds such as epoxypropane.

When a surfactant is used as the fluorine-containing compound (I) in the present invention, a cationic surfactant and a nonionic surfactant are preferred, and a cationic surfactant is most preferred.

The absorbent composition of the present invention comprises a water absorbent resin and a fluorine-containing compound (I) having a structural unit represented by the general formula (I). At that time, the fluorine-containing compound (I) was added in an amount of 0.001 with respect to 100 parts by weight of the water absorbent resin.
It is preferably in the range of 10 to 10 parts by weight, and when the ratio is in this range, a water absorbing agent having particularly high gel strength can be obtained. Even if the amount of the fluorine-containing compound (I) used exceeds 10 parts by weight, the corresponding effect cannot be obtained, which is uneconomical. vice versa,
When the amount is less than 0.001 part by weight, the effect of improving the gel strength is small.

The method for producing the absorbent composition of the present invention comprises a water-absorbent resin having a physiological saline absorption capacity of 10 g / g or more, and a fluorine-containing compound having the structural unit represented by the general formula (I) ( It can be achieved by mixing with I), but in order to obtain a water-absorbing composition in which the gel strength is remarkably improved, the fluorine-containing compound (I) is added to 100 parts by weight of the water-absorbing resin.
The proportion is preferably 0.001 to 10 parts by weight.

Specific examples of the manufacturing method of the present invention include:
(1) A method in which the water-absorbent resin and the fluorine-containing compound (I) are directly mixed, or (2) the fluorine-containing compound (I) is dissolved or dispersed in an appropriate solvent, and the solution or dispersion is absorbed with water. And a method of mixing with a resin.

When the water-absorbent resin and the fluorine-containing compound (I) are mixed in the presence of water, it may be preferable to use this water as a solvent for the fluorine-containing compound (I).
At that time, the amount of water was 0.
The proportion is in the range of 01 to 50 parts by weight, more preferably 0.01 to 30 parts by weight. If the amount of water exceeds 50 parts by weight, the water-absorbent resin becomes mochi-like, which makes uniform mixing difficult, and it is uneconomical because it requires drying. On the other hand, if the amount of water is less than 0.01 part by weight, the effect of adding water is not recognized.

The mixing is generally carried out by spraying or dropping the fluorine-containing compound (I), or a solution or dispersion thereof, onto the water-absorbent resin and mixing them. As a mixer used for mixing, a mixer having a large mixing force is preferable for uniform mixing, but a normal mixer or a kneader can be used.
For example, cylindrical type mixer, double cone type mixer, buoy type mixer, ribbon type mixer, screw type mixer, fluidized type mixer, rotary disk type mixer, air flow type mixer, double arm type kneader. Japanese-style machines, internal mixers, muller type kneaders, roll mixers, screw type extruders and the like.

In carrying out the present invention, the effect can be further enhanced by heating during or after the mixing of the water absorbent resin and the fluorine-containing compound (I).

To heat the mixture of the water absorbent resin and the fluorine-containing compound (I), a usual dryer or heating furnace can be used. For example, a groove-type stirring dryer, a rotary dryer, a disk dryer, a kneading dryer, a fluidized bed dryer, an air stream dryer, an infrared dryer and the like. The heating temperature is in the range of 40 to 200 ° C, preferably 120 to 200 ° C. 200
Care must be taken at high temperatures above 0 ° C, as thermal degradation may occur depending on the type of surfactant. On the other hand, when the temperature is lower than 40 ° C., the effect of the heat treatment is hardly seen. When heating the water absorbent resin and the fluorine-containing compound (I) during mixing, a heating device may be installed in the above mixer.

[0032]

According to the method of the present invention, a water absorbent composition having improved gel strength and improved absorption capacity can be obtained. Therefore, it can be suitably used as a sanitary material, a water retention agent for agricultural and horticultural use, a sludge solidifying agent, a dew condensation preventing agent for building materials, and a water blocking agent for civil engineering.

[0033]

EXAMPLES The present invention will be described below with reference to examples.
The scope of the invention is not limited to only these examples.

Reference Example 1 Synthesis Example of Water-Absorbent Resin Particles (A) In a stainless steel kneader with a jacket having an internal volume of 10 liters and two sigma type blades, 75 mol% sodium acrylate and 25 mol% acrylic acid were added. 5500 g of a monomer aqueous solution (monomer concentration 38%) and trimethylolpropane triacrylate as a crosslinking agent 3.
5 g (0.05 mol% with respect to the monomer) was charged, and nitrogen gas was blown into the reaction system to replace it with nitrogen. 35 on the jacket
The mixture was heated with warm water of ℃, and 2.8 g of sodium persulfate as a polymerization initiator and 0.1 g of L-aspartic acid were added to the mixture to start the polymerization, while rotating and stirring the sigma type blade at 40 rpm. The polymerization reaction was carried out for 1 hour. After the reaction was completed, the water-containing gel polymer finely divided was spread on a wire net having an opening of 0.03 mm and dried at 160 ° C. for 1 hour. The dried product obtained is crushed using a hammer mill and passed through 850 μm for 3
Water-absorbent resin particles (A) which did not pass through 00 μm were obtained.

Example 1 Water-absorbent resin particles (A) 100
To 1 part, 1 part of Florade FC-135 (cationic fluorochemical surfactant, manufactured by Sumitomo 3M Co., Ltd.), 3 parts of isopropyl alcohol, and 2 parts of water were added and mixed, followed by drying with cold air at 25 ° C. for 1 hour and absorbing water. An agent composition (A) was obtained. The water absorbent composition (A) and the water absorbent resin particles (A) thus obtained were evaluated by the following methods, and the obtained results are shown in Table 1.

A: Absorption capacity 0.2 g of the water-absorbent agent composition or the water-absorbent resin particles is placed in a non-woven tea bag type bag and dipped in 0.9% saline solution to obtain 6
The weight after 0 minutes was measured, and the absorption capacity was determined according to the following formula 1.

[0037]

[Equation 1]

B: Gel strength 0.338 g of a sample of water-absorbent resin particles or absorbent composition which passed 850 μm and did not pass 300 μm and had an inner diameter of 23
Put in mm test tube (Fisher Scientific), 25 ℃
Pour 10.0 g of artificial urine whose temperature has been adjusted. Next, pressure gauge (Cr
Own Tool & Supply Co.) with 6.5mm diameter and 8 length
Measuring disk part of the pressure gauge (diameter 2 connected by 0 mm rod
0.5 mm, thickness 2.5 mm) quickly, that is, before the gel surface where the sample absorbs artificial urine and gels reaches the artificial urine surface, the upper surface of the measurement disk and the artificial urine surface are the same. Contact with artificial urine so that it is high. 30 minutes after the sample absorbs artificial urine and gels, the gel surface reaches the lower surface of the measurement disk, the sample absorbs liquid and gels, and the force generated by the swelling of the gel is measured with a pressure gauge. Then
This pressure was evaluated as gel strength.

The composition of artificial urine used for the measurement is shown below.

H ₂ O 99.425 wt% KCl 0.200 wt% Na ₂ SO ₄ 0.200 wt% (NH ₄ ) H ₂ PO ₄ 0.085 wt% (NH ₄ ) ₂ HPO ₄ 0.015 wt% CaCl ₂ .2H ₂ O 0.025 wt% MgCl ₂ .6H ₂ O 0.050 wt% (Example 2) 1 part of Florade FC-135 (cationic fluorosurfactant, Sumitomo 3M Co., Ltd.), isopropyl alcohol to 100 parts of the water absorbent resin particles (A) 3 parts and 2 parts of water were added and mixed. The obtained mixture was placed in a bowl immersed in an oil bath (195 ° C.) and heat-treated for 45 minutes under stirring to obtain a water absorbing composition (B).
The obtained water absorbent composition (B) was evaluated in the same manner as in Example 1, and the obtained results are shown in Table 1.

(Example 3) Water-absorbent resin particles (A) 100
To 3 parts, 0.1 part of 3-perfluorooctyl-1,2-epoxypropane and 3 parts of isopropyl alcohol were added and mixed. The obtained mixture was put into an oil bath (120
The mixture was placed in a bowl soaked in (° C.) And heat-treated for 45 minutes under stirring to obtain a water-absorbent agent composition (C). The water absorbent composition (C) thus obtained was evaluated in the same manner as in Example 1, and the results obtained are shown in Table 1.

(Example 4) Water-absorbent resin particles (A) 100
To 1 part, 0.1 parts of 1H, 1H, 7H-dodecafluoropentanol and 3 parts of isopropyl alcohol were added and mixed. The obtained mixture was put into a bowl immersed in an oil bath (160 ° C.), and heat-treated for 45 minutes under stirring to obtain a water absorbing composition (D). The obtained water absorbent composition (D) was evaluated in the same manner as in Example 1, and the obtained results are shown in Table 1.

(Comparative Example 1) The water-absorbent resin particles (A) were placed in a bowl soaked in an oil bath (195 ° C) and heat-treated for 45 minutes under stirring to obtain a comparative water-absorbing agent (A). .
The obtained comparative water-absorbing agent (A) was evaluated in the same manner as in Example 1, and the obtained results are shown in Table 1.

Reference Example 2 Synthesis Example of Water-Absorbent Resin Particles (B) Corn starch 50 parts, water 200 parts and methanol 1
000 parts was charged into a reactor equipped with a stir bar, a nitrogen blowing tube and a thermometer, stirred at 50 ° C. for 1 hour under a nitrogen stream and then cooled to 30 ° C., 25 parts acrylic acid, 75 parts sodium acrylate. , 0.5 part of methylenebisacrylamide, 0.1 part of ammonium persulfate as a polymerization initiator and 0.1 part of sodium hydrogen sulfite as a promoter were added and reacted at 60 ° C. for 4 hours. A suspension was obtained. The powder obtained by filtering this white suspension,
Washed with a water-methanol mixed solution (water to methanol in a weight ratio of 2:10), dried under reduced pressure at 60 ° C. for 3 hours and then pulverized, and then water-absorbent resin particles (B) passing 850 μm and not passing 300 μm. Got

Example 5 Water-absorbent resin particles (B) 100
0.01 part of Fluorad FC-135 (cationic fluorochemical surfactant, manufactured by Sumitomo 3M Ltd.) was added to and mixed with the parts. The obtained mixture is put into an oil bath (120 ° C)
The mixture was placed in a bowl soaked in and heat-treated for 45 minutes under stirring to obtain a water absorbing composition (E). The water absorbent composition (E) and the water absorbent resin particles (B) thus obtained were evaluated in the same manner as in Example 1, and the results obtained are shown in Table 1.

Comparative Example 2 The water-absorbent resin particles (B) were placed in a bowl immersed in an oil bath (120 ° C.) and heat-treated for 45 minutes under stirring to obtain a comparative water-absorbing agent (B). The obtained comparative water absorbent (B) was evaluated in the same manner as in Example 1, and the results obtained are shown in Table 1.

Reference Example 3 Synthesis Example of Water-Absorbent Resin Particles (C) Water-absorbent resin particles (A) 100 obtained in Reference Example 1
Parts by weight were mixed with an aqueous mixture consisting of 1 part by weight glycerin, 2 parts by weight water and 4 parts by weight isopropanol. The obtained mixture was put into a bowl immersed in an oil bath (195 ° C.) and heat-treated for 30 minutes under stirring. The obtained heat-treated product was classified using a sieve to obtain water-absorbent resin particles (C) which passed 850 μm and did not pass 300 μm.

(Example 6) Water absorbing resin particles (C) 100
0.1 part of Fluorard FC-135 (cationic fluorine-based surfactant, manufactured by Sumitomo 3M Ltd.) was added to and mixed with the parts. The obtained mixture was put into a bowl immersed in an oil bath (160 ° C.) and heat-treated for 45 minutes under stirring to obtain a water absorbing composition (F). The water absorbent composition (F) and the water absorbent resin particles (C) thus obtained were evaluated in the same manner as in Example 1, and the results obtained are shown in Table 1.

(Example 7) Water-absorbent resin particles (C) 100
0.1 part of Fluorard FC-171 (nonionic fluorosurfactant, manufactured by Sumitomo 3M Co., Ltd.) was added to and mixed with 1 part of the mixture, and the mixture was dried with cold air of 25 ° C. for 1 hour to obtain a water absorbing composition (G). Obtained. The obtained water absorbing composition (G) was used in Example 1
Evaluation was carried out in the same manner as in, and the obtained results are shown in Table 1.

Example 8 Water-absorbent resin particles (C) 100
0.1 part of Florade FC-171 (nonionic fluorine-based surfactant, manufactured by Sumitomo 3M Ltd.) was added to and mixed with the parts. The obtained mixture was placed in a bowl immersed in an oil bath (160 ° C.) and heat-treated for 45 minutes under stirring to obtain a water-absorbent composition (H). The obtained water absorbing agent composition (H) was evaluated by the same method as in Example 1, and the obtained results are shown in Table 1.

Comparative Example 3 Water-absorbent resin particles (C) 100
Part was placed in a bowl immersed in an oil bath (160 ° C.) and heat-treated for 45 minutes under stirring to give a comparative water absorbing agent (C).
Got The obtained comparative water absorbing agent (C) was evaluated in the same manner as in Example 1, and the obtained results are shown in Table 1.

[0052]

[Table 1]

Claims (17)

[Claims] 1. A water-absorbent resin having a physiological saline absorption capacity of 10 g / g or more and the following general formula (I): (Here, n is an integer of 1 or more, m is 0 or an integer of 1 or more, and n ≧ m.) A water-absorbing agent composition comprising the fluorine-containing compound (I) having a structural unit represented by 2. The water absorbing agent composition according to claim 1, wherein the ratio of the fluorine-containing compound (I) is 0.001 to 10 parts by weight with respect to 100 parts by weight of the water absorbent resin. 3. The water-absorbent resin is a carboxyl group and / or
The water absorbent composition according to claim 1, which further comprises an alkali metal salt thereof. 4. The water absorbing agent composition according to claim 1, wherein the fluorine-containing compound (I) is a surfactant. 5. The water absorbing agent composition according to claim 1, wherein the fluorine-containing compound (I) is a compound having a group capable of reacting with a functional group of the water absorbent resin. 6. The water absorbing agent composition according to claim 4, wherein the fluorine-containing compound (I) is a cationic or nonionic surfactant. 7. A water-absorbent resin having a physiological saline absorption capacity of 10 g / g or more and the following general formula (I): (Wherein n is an integer of 1 or more, m is 0 or an integer of 1 or more, and n ≧ m), and the fluorine-containing compound (I) having a structural unit represented by the formula is mixed. A method for producing a water absorbing agent composition. 8. The method for producing a water absorbent composition according to claim 7, wherein the ratio of the fluorine-containing compound (I) is 0.001 to 10 parts by weight with respect to 100 parts by weight of the water absorbent resin. 9. Mixing is carried out in the presence of water.
A method for producing the water absorbing agent composition described. 10. The method for producing a water absorbing agent composition according to claim 9, wherein the amount of water is 50 parts by weight or less based on 100 parts by weight of the water absorbent resin. 11. The method according to claim 7, wherein heating is performed during or after mixing.
11. The method for producing the water absorbent composition according to any one of 10. 12. The method for producing a water absorbing agent composition according to claim 10, wherein the amount of water is 0.01 to 30 parts by weight with respect to 100 parts by weight of the water absorbent resin. 13. A water-absorbent resin having a carboxyl group and / or an alkali metal salt thereof, according to claim 7.
5. A method for producing the water absorbent composition according to any one of 1. 14. The method for producing a water absorbing agent composition according to claim 7, wherein the fluorine-containing compound (I) is a surfactant. 15. The fluorine-containing compound (I) is a compound having a group capable of reacting with a functional group of the water absorbent resin.
15. The method for producing the water absorbing agent composition according to any one of 14. 16. The method for producing a water absorbing agent composition according to claim 14, wherein the fluorine-containing compound (I) is a cationic or nonionic surfactant. 17. The method for producing a water absorbing agent composition according to claim 11, wherein the heating temperature is 40 to 200 ° C.