JP2002086624A - Water absorbing body and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sandbag suitable for transport and capable of sufficiently performing the disposal against flooding or the like when actually used. SOLUTION: A polymeric material which contains at least one of styrene and conjugated diene and acrylonitrile is treated with an acid, and the obtained product is finely divided to a form water absorbing resins 3a and 3b with an average particle size of 5 mm or less. A water permeable bag material 2 is filled with these resins to manufacture a water absorbing body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water absorbing body for absorbing and removing unnecessary water remaining due to water leakage, flooding, and the like, and more particularly, to raising a levee, repairing a breach, etc., when a river is flooded. The present invention relates to a water-absorbing body having a function of a sandbag used for a water absorbent.

[0002]

2. Description of the Related Art In general, embankments for preventing flooding of rivers, etc. are raised and damaged levee are repaired by stacking sandbags filled with hemp bags and the like with soil and sand. .

[0003]

However, such sandbags have a problem that they are not suitable for transportation because of their large volume and weight. In particular, a large vehicle such as a truck must be used to transport the sandbags from a distance, and it takes time to load and unload them. This inconvenience of transportation is particularly noticeable in times of urgent river flooding.

In order to eliminate the inconvenience of transportation,
When filling sandbags etc. with soil etc. near the flooding place of the river and making sandbags, during the flooding of the river etc., it is necessary to provide time to make this sandbag, There is a problem that treatment for flooding and the like is delayed.

In addition, there is not always enough soil or the like to make sandbags near the flood site, and in that case, there is a problem that the treatment for the flood or the like becomes insufficient.

[0006] The present invention has been made in view of the above points, and an object of the present invention is to provide a water absorbing body that is suitable for transportation and that can perform a sufficient measure against flooding and the like in actual use. I do.

Another object of the present invention is to provide a method for producing a water absorbing body suitable for transportation and capable of performing a sufficient measure against flooding and the like in actual use.

[0008]

According to the present invention, in order to solve the above-mentioned problems, in a water-absorbent body in which a water-absorbent resin is filled in a water-permeable bag-like body, the water-absorbent resin contains at least styrene and conjugated diene. A modified polymer that is obtained by subjecting a polymer material containing one and acrylonitrile to an acid treatment and changes into a gel by absorbing water, and the average particle size of the water-absorbent resin in a dry state is 5 m.
m or less.

Here, the water-absorbing resin absorbs unnecessary water remaining due to water leakage, flooding, and the like, and further increases its volume and weight by absorbing water. or,
In the method for producing a water-absorbent body in which a water-absorbent resin is filled inside a water-permeable bag-like body, a polymer material containing at least one of styrene and a conjugated diene and acrylonitrile is subjected to an acid treatment, which is obtained by the acid treatment. A method for producing a water-absorbent body, characterized in that the water-absorbent resin is reduced to an average particle size in a dry state of 5 mm or less.

By doing so, unnecessary water remaining due to water leakage, flooding, etc. is absorbed, and furthermore,
By absorbing water, a water absorbing body whose volume and weight can be increased can be manufactured.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described.

FIG. 1 is a sectional view showing the structure of the water absorbing body 1 in the present embodiment. Here, (a) of FIG. 1 is a cross-sectional view showing the water-absorbing body 1 before water absorption, and (b) of FIG. 1 is a cross-sectional view showing the water-absorbing body 1 after water absorption.

The water-absorbent body 1 includes a water-permeable bag-like body 2 formed in a sheet shape and formed of a water-permeable material in a bag shape, and a water-absorbent resin 3a contained in the water-permeable bag-like body 2. , 3b
Is provided.

The water-absorbent resins 3a and 3b are obtained by drying a modified polymer obtained by acid-treating a polymer material containing at least one of styrene and conjugated diene (butadiene, isoprene) and acrylonitrile, and drying the polymer. This is a reduction in particle size.

The polymer material may contain acrylonitrile units in the polymer material in an amount of 5 to 80 mol%, preferably 10 to 60 mol%, more preferably 20 to 50 mol%.
It is desirable to include one. If this content is less than this value, the polymer material will exhibit water solubility during the heat treatment described below, making it unsuitable as a water-absorbing resin. On the other hand, if the content is too large, the polymer material becomes hard and becomes difficult to pulverize into small pieces, or the content of styrene and conjugated diene in the material is relatively reduced, so that the hydrophilic group is reduced. , The water absorption effect (particularly with respect to the aqueous electrolyte solution) decreases.

As a structural unit other than acrylonitrile in the polymer material, at least one of styrene and a conjugated diene is contained in an amount of 20 to 95 mol%, preferably 40 to 95 mol%.
It is desirably contained in an amount of about 85 mol%, more preferably 50 to 80 mol%. An ionic acidic group is introduced into these styrene and conjugated diene constituent units by a heat treatment described later, and thereby, the resulting water-absorbent resin 3
a, 3b (particularly with respect to the aqueous electrolyte solution) can be improved.

If the above-mentioned acrylonitrile, styrene and conjugated diene are contained, another constituent unit may be contained in the polymer material. Examples of the other structural unit include maleic anhydride, itaconic anhydride, α-methylstyrene, acrylamide, methacrylamide, acrylic acid and methacrylic acid ester (unit number: 1 to 10 of saturated and unsaturated hydrocarbons),
Methacrylic acid and methacrylic acid ester (unit number:
1-10 saturated and unsaturated hydrocarbons), vinyl acetate, vinyl chloride, ethylene, propylene, butylene, vinyl pyrrolidone, vinyl pyridine and the like.

As the molecular weight (Mw) of the polymer material, the weight average molecular weight (Mw) is preferably from 1,000 to 200,000,000, and more preferably from 10,000 to 1,000,000. If the molecular weight is lower than this,
After the heat treatment described below, the polymer material becomes water-soluble, so that sufficient water absorption properties cannot be obtained.
On the other hand, when the molecular weight is higher than this, the reaction rate in the acid treatment described later becomes slow, which is not practical.

As a specific example of the polymer material, AB
S resin, SAN resin, ASA resin, ACS resin, NBR
Rubber and the like are preferred. These materials may be newly-produced virgin pellets, discharged materials (semi-finished products) in the production process of resin raw materials and molded products, housings and various parts used in electric products, automobiles, and the like. Materials or used waste materials such as tubes, hoses, and various types of cushioning materials may be reused. This makes it possible to reuse polymer waste materials, inorganic solid waste materials, and the like, which have been troubled as wastes, and can contribute to the improvement of the global environment. The waste materials to be reused may be collected from general households, factories, stores, etc., but the waste materials collected from factories, stores, etc., which handle a large number of the same type of product, are more common households. It is more desirable because the composition is more stable than the waste material recovered from the wastewater.

The polymer material may be an alloy with other resins, and is a waste material containing additives such as dyes, stabilizers, flame retardants, plasticizers, fillers, and other auxiliary agents. Or a mixture of waste material and virgin material.

The other resin which can be mixed with the polymer material is desirably a resin which does not inhibit the acid treatment described later. Examples of such a resin include polyphenylene ether, polycarbonate, polyphenylene sulfide, polyethylene terephthalate, and the like. Examples thereof include polybutylene terephthalate, polyamide, and polyester. It is desirable that these resins are mixed at a ratio of 60% by weight or less based on the polymer material. This is because if the content of these resins is too large, the acid treatment reaction described below will be inhibited.

It is desirable that the polymer material is formed into small pieces before the acid treatment. If the size of the polymer material is large, the area of the reactant per volume becomes small, and it becomes difficult to perform acid treatment.
Further, the water absorption is significantly reduced.

Examples of a method of turning the polymer material into small pieces include a method of crushing the polymer material with a crusher and sieving the material,
A method of dissolving by heating and petalizing into fine beads may be used. When a polymer material containing a rubber component is pulverized by a pulverizer, it is preferable that the polymer material is once frozen and then pulverized. Further, it is desirable that the small piece size of the polymer material is 3.5 mesh or less.

Further, carbon black,
When an inorganic substance such as titanium oxide is contained, an acid treatment described later is accelerated (the periphery of the inorganic pigment is easily acidified. During the reaction, the inorganic pigment separates from the polymer material, and the acid penetrates the polymer material. Water-absorbent resin 3a,
3b improves the water absorption effect. The inorganic substances such as carbon black and titanium oxide may be originally contained in the polymer material, or may be separately added and mixed. The former is more desirable in terms of improvement.

The inorganic substances such as carbon black and titanium oxide may be those generally used as a coloring agent, a reinforcing agent, and a conductivity imparting agent for plastics. The carbon black may be produced by any of the channel method, the furnace method, and the thermal method, and may be used alone or in combination. The average particle size of the carbon black is 5 to 50.
It is preferably about 0 μm, more preferably about 10 to 50 μm. The titanium oxide may be any of rutile type, anatase type, and ultrafine titanium particles, and may be used alone or in combination of two or more. The average particle size of the titanium oxide is preferably about 0.01 to 50 μm, more preferably about 0.05 to 10 μm. Further, the content of the inorganic substance such as carbon black and titanium oxide in the polymer material is preferably 0.01 to 20% by weight, more preferably 0.05 to 10% by weight based on the dry weight.

In the present embodiment, a polymer material containing at least one of styrene and conjugated diene and acrylonitrile is converted into a water-absorbent resin by acid treatment.
That is, by this acid treatment, part of acrylonitrile in the polymer material is hydrolyzed, and an ionic group is introduced into styrene and the conjugated diene.

As the acid used in the acid treatment, an inorganic acid is preferable. The amount of the inorganic acid charged is preferably about 1 to 500 times the weight of the polymer material to be subjected to the acid treatment,
It is more preferably about 200 times. If the amount of addition of the inorganic acid is less than this, the rate of hydrolysis of acrylonitrile groups and the rate of introduction of ionic groups into styrene and conjugated diene decrease, and the water absorbing properties of the produced water absorbent resins 3a and 3b decrease. Becomes On the other hand, if the addition amount of the inorganic acid is too large, it is necessary to neutralize the excess inorganic acid, which is disadvantageous both economically and operationally.

Examples of such inorganic acids include sulfonating agents such as concentrated sulfuric acid, sulfuric anhydride, fuming sulfuric acid and chlorosulfonic acid, and nitric acid, fuming nitric acid, phosphoric acid, phosphorus chloride and phosphorus oxide. Among these, concentrated sulfuric acid, sulfuric anhydride, fuming sulfuric acid, and chlorosulfonic acid are preferable, and particularly, 70% by weight or more of concentrated nitric acid is more preferable.

These inorganic acids may be used alone or in combination of two or more.
When used in combination, two or more inorganic acids may be used as a mixture, or may be used while being sequentially added. As a combination example, for example, when a polymer material is first treated with concentrated sulfuric acid, and then sulfuric anhydride is added,
A water-based water-absorbent resin 3b having a stable shape can be obtained.
This is because the treatment of concentrated sulfuric acid mainly hydrolyzes the acrylonitrile portion in the polymer material, and then the treatment with sulfuric anhydride causes the styrene or conjugated diene portion to be forcibly sulfone-crosslinked, thereby reducing the degree of crosslinking. High water absorbing resin 3a, 3b
Is configured.

The above acid treatment may be performed in a system using an organic medium. In this case, usable organic media include C1-2 aliphatic halogenated hydrocarbons (preferably 1,2-dichloroethane, chloroform, dichloromethane, 1,1-dichloroethane) and aliphatic cyclic hydrocarbons (preferably, , Cyclohexane, methylcyclohexane, cyclopentane), nitromethane, nitrobenzene, sulfur dioxide, paraffinic hydrocarbon (carbon number: 1)
To 7), acetonitrile, carbon disulfide, tetrahydrofuran, tetrahydropyran, 1,2-dimethoxyethane, acetone, methyl ethyl ketone, thiophene and the like. Among them, C1-2 aliphatic halogenated hydrocarbons, aliphatic cyclic hydrocarbons, nitromethane, nitrobenzene, and sulfur dioxide. These solvents may be used alone or as a mixture of two or more. In this case, there is no particular limitation on the mixing ratio of the medium. The amount of the organic medium to be charged is preferably less than 200 times the weight of the polymer material to be subjected to the acid treatment. If the addition amount of the organic medium is larger than this, the reaction rate of the acid treatment becomes low and it is economically disadvantageous.

In the acid treatment, a Lewis base may be used if necessary. Examples of the Lewis base include alkyl phosphate (triethyl phosphate, trimethyl phosphate), dioxane, acetic anhydride, ethyl acetate, ethyl palmitate, diethyl ether, thioxane, and the like. Further, the inorganic acid or organic solvent once used in the acid treatment may be recovered after the completion of the reaction and recovered as it is, or may be recovered by a method such as extraction or distillation and reused in the reaction.

As described above, in this embodiment, an ionic group is introduced into the styrene and conjugated diene portions by subjecting the polymer material to acid treatment, and the acrylonitrile portion undergoes a hydrolysis reaction.
It is converted into a water-absorbing resin by amidation. Ionic groups introduced into styrene and the conjugated diene portion by acid treatment include sulfonic acid and / or a salt thereof,-
PO (OH) ₂ and / or a salt thereof, -CH ₂ PO (OH)
₂ and / or a salt thereof, —NO ₂ . Among these ionic groups, sulfonic acids and / or salts thereof are preferred. For example, when a sulfone group is introduced as an ionic group, this sulfone group is introduced by reacting a polymer material with a sulfonating agent such as concentrated sulfuric acid, sulfuric anhydride, fuming sulfuric acid, chlorosulfonic acid, or the like, or in a solvent. By doing it. In addition, these ionic groups may be introduced by introducing a single species into the polymer material or by introducing two or more species into the polymer material. However, in order to secure the performance as the water absorbent resin 3a, 3b, the amount of the ionic group contained in the polymer material is preferably 5 to 95 mol%, and more preferably 10 to 70 mol% based on all units.
Molar% is more preferred. If the ionic group introduction rate is higher than this, the acid-treated product of the polymer material shows water solubility, and cannot be used as the water-absorbing resins 3a and 3b. On the other hand, if the introduction rate is lower than this, the water absorption effect (particularly with respect to the aqueous electrolyte solution) is reduced.

Next, the acid treatment conditions for introducing a predetermined amount of ionic groups into the polymer material will be described. The acid treatment reaction temperature varies greatly depending on whether or not an organic solvent is used.
About 200 ° C. is preferable, and about 30 to 120 ° C. is more preferable. Here, if the acid treatment reaction temperature is too low, the reaction rate becomes too slow to be practical and water-absorbent resins 3a and 3b having good performance cannot be obtained. On the other hand, when the acid treatment reaction temperature is too high, the molecular chain of the polymer material is easily broken by thermal decomposition, and the polymer material is easily dissolved in water.

The acid treatment reaction time varies greatly depending on the acid treatment reaction temperature, but is preferably about 1 minute to 40 hours, and is preferably about 5 minutes.
More preferably, the time is from about 2 minutes to 2 hours. Here, if the acid treatment reaction time is too short, the reaction does not proceed sufficiently, while if it is too long, the production efficiency deteriorates.

The washing of the reactant by acid treatment is carried out by putting the reactant together with the reaction solution into a large amount of water or a basic aqueous solution, or removing the reactant from the reaction system by filtering with a filter or the like. The reaction is carried out by putting only the reactant thus taken out into a large amount of water or a basic aqueous solution. By this washing, the nitrile group in the polymer material is converted into an amide group or a carboxyl group and / or a salt thereof.

The basic substance constituting the basic aqueous solution used for the washing includes alkali metal (sodium, lithium, potassium, etc.), alkaline earth metal (magnesium, calcium, etc.) oxide, water, etc. Oxides,
Compounds such as carbonate, acetate, sulfate, phosphate and the like can be mentioned. However, in order to improve the water-absorbing effect of the water-absorbing resins 3a and 3b (particularly with respect to the electrolyte aqueous solution) and the deodorizing effect of ammonia gas and the like, the neutralization with the basic aqueous solution is not performed, and the cleaning is performed only with water. It is desirable to do.

A gel-like reactant is produced by the above treatment, and the produced reactant is then dried by a method such as solar radiation, heating, decompression, centrifugation, and pressing to obtain a desired water absorption. Resin 3a, 3b is obtained. The water-absorbing resins 3a and 3b thus obtained have an unreacted nitrile group, thereby improving water-insolubility and gel strength.
In particular, the water absorption of the electrolytic aqueous solution can be improved.

The gel-like reactant dried as described above is a lump having relatively high hardness. In the state of such a lump, a sufficient effect as the water-absorbent resin 3a, 3b cannot be obtained. Therefore, in the present embodiment, the lump is pulverized or the like to be finely divided, and sieved as necessary. Further, as a method of forming the reactant into fine particles, the above-mentioned gel-like reactant may be dried by spray drying.

The particle size of the water-absorbent resin 3a, 3b in the dry state to be finely divided is 0.001 mm to 5% in average particle size.
mm, preferably about 0.01 mm to 1 mm. If the particle size is too large, the water-absorbing swelling speed of the water-absorbent resins 3a and 3b in a dry state does not increase, which is not preferable.
On the other hand, if the particle diameter is too small, the particles of the water-absorbent resins 3a and 3b pass through the water-permeable bag 2 and flow out to the outside, which is not preferable.

The water-permeable bag 2 is a bag formed of a liquid-permeable sheet, and the sheet is formed in a plurality of layers as necessary. As a material constituting the water-permeable bag 2, a cloth of natural fibers or synthetic fibers is used. Natural fibers include cotton, hemp, silk, and the like, and synthetic fibers include polyamide, polyimide, polyester, polyethylene, and polypropylene.
Further, such a cloth may be formed by knitting a single kind of fiber, or may be formed by knitting a mixture of plural kinds of fibers. further,
It may be a non-woven fabric or a film-like sheet formed with pores penetrating the front and back surfaces thereof.

As shown in FIG. 1, the water-absorbent resins 3a and 3b generated as described above are filled in the water-permeable bag 2 and the water-permeable bag 2 is filled with water. Resin 3
The entrance is closed so that a and 3b do not spill outside.

The water absorbing body 1 thus configured has a water absorbing property, and by using the water absorbing body 1, it becomes possible to remove unnecessary water and the like remaining due to water leakage, flooding and the like. Become.

Further, the water-absorbent resin 3a in a dry state absorbs moisture, so that the water-absorbent resin 3a becomes a gel-like water-absorbent resin 3b having both increased volume and mass as shown in FIG. Change. Further, the water-absorbing resin 3b thus changed has a sufficient shape following property, and the water-absorbing body 1 that has absorbed moisture in this way serves as a sandbag capable of performing a sufficient treatment for flooding and the like. It is possible to fulfill the function.

The water-absorbent resin 3b which has absorbed water and has increased in volume changes to the water-absorbent resin 3a having a small original volume and weight by being dried. Thereby, the function as a sandbag after water absorption and after water absorption can be repeatedly performed.

As described above, in the present embodiment, the polymer material containing at least one of styrene and conjugated diene and acrylonitrile is treated with an acid, and the product is formed into fine particles having an average particle size of 5 mm or less. The water-absorbent resin 3a, 3b thus filled is filled in the water-permeable bag-shaped body 2 to produce the water-absorbent body 1, so that water remaining due to water leakage, flooding, etc. is absorbed and removed. It is possible to do.

The water-absorbent resins 3a and 3b change into a gel state due to water absorption and increase in volume and weight while maintaining sufficient shape followability.
When the water-absorbent resin 3a is transported in a dry state and used as a sandbag, the volume and weight can be increased by absorbing water. Therefore, by using the water absorbing body 1, it is possible to perform a sufficient treatment for flooding and the like at the time of actual use while maintaining convenience in transportation.

The water absorbent 1 may contain a surfactant. In this case, the surfactant is water absorbent 1
Permeable bag-like body 2 and water-absorbent resin 3a, 3b
This allows the water absorbing body 1 to improve the water absorbing speed. As the surfactant to be used, anionic surfactants, cationic surfactants, nonionic surfactants, and zwitterionic surfactants are suitable. Particularly, anionic surfactants and nonionic surfactants are preferable. Surfactants are more preferred. By using an anionic surfactant and / or a nonionic surfactant, an ionic group formed on the water absorbent resin 3a, 3b, in particular, an ionic group formed by salt formation of an acid group and an organic cation of the surfactant. Of the water-absorbent resin can be prevented, and a decrease in the water-absorbency of the water-absorbent resin can be prevented.

Examples of anionic surfactants include fatty acid salts, higher alcohol sulfates, liquid fatty oil sulfates, aliphatic amines, sulfates of aliphatic amides, fatty alcohol phosphates, and dibasic fatty acid esters. Sulfonate, fatty acid amide sulfonate, and formalin-condensed naphthalene sulfonate. Examples of the cationic surfactant include an aliphatic amine salt, a quaternary ammonium salt, and an alkylpyridinium salt. Examples of the nonionic surfactant include polyoxyethylene alkyl ether, polyoxyethylene alkyl phenol ether, polyoxyethylene alkyl ester, sorbitan alkyl ester, and polyoxyethylene sorbitan alkyl ester.

The amount of the surfactant added is 0.01 to 0.01 with respect to the dry state of the water-permeable bag 2 and the water-absorbent resin 3a.
It is preferably about 10% by weight, more preferably about 0.1 to 5% by weight. Here, if the addition amount is too large, the surfactant may be released from the water-absorbing resin 3b in the water-absorbing state and contaminate the outside, which is not preferable. On the other hand, if the addition amount is too small, the surfactant is added. This is not preferable because the effect of increasing the water absorption speed of the water absorbing body 1 cannot be exhibited.

Next, an example of the water absorbing body 1 in the present embodiment will be described. Note that the present invention is not limited to the contents of the following embodiments.

[0051]

Example 1 A thick cotton cloth bag was prepared as a water-permeable bag-like body, and the water-absorbent resin prepared as described below was put into the bag, and the bag was closed. (Preparation of water-absorbing resin) Concentrated sulfuric acid (96% by weight): 30 parts by weight, ABS resin waste material (8 mm cassette tape guard panel: black portion, styrene: 52 mol%, acrylonitrile: 28 mol%, butadiene: 20 mol) Further, 1 part by weight of carbon black: containing 2% by weight mol and pulverized to 16 to 32 mesh by a frozen shredder) was added, and reacted at 80 ° C. for 20 minutes.

After the completion of the reaction, the solid matter in the reaction system was filtered through a glass filter, washed with water, neutralized with 50 parts by weight of 1N sodium hydroxide solution, and further washed with sufficient water.
When the pH of the filtrate became 8 or less, it was taken out and dried at 105 ° C. for 2 hours in a circulating drier.

By this operation, a black solid was obtained. From the elemental analysis result of sulfur, it was confirmed that the sulfonic acid group in this solid was 33 mol% in all monomer units. The sodium content was almost equimolar to the sulfonic acid group (1: 1). This black solid was pulverized to an average particle size of 0.8 mm.

[0054]

Example 2 The black solid described in Example 1 was pulverized with an average particle size of 0.5 mm. For other points, Example 1
Is the same as

(Comparative Example) A water-absorbing body was prepared without pulverizing the black solid described in Example 1. At this time, the average particle size of the water absorbent resin was 8 mm.

(Comparative Results) The water absorbers of the same size produced in Example 1, Example 2 and Comparative Example were
cm on a uniform water surface, and the rate of water absorption and swelling was estimated by the change in the thickness of each water absorber. Before immersion, the thickness of each water absorber was almost the same, but the thickness one minute after the start of immersion was 2.9 cm for the water absorber of Example 1, 3.2 cm for the water absorber of Example 2, and 1.6 in the example water absorber
cm. Thereby, it became clear that water absorption can be increased by reducing the particle size.

Next, a second embodiment will be described. This embodiment is a modification of the first embodiment. The first embodiment is different from the first embodiment only in that a solid substance having a specific gravity of 1 or more is contained in a water absorbent resin.
This embodiment is different from the embodiment. The following description focuses on differences from the first embodiment, and a description of common parts will be omitted.

FIG. 2 is a sectional view showing the structure of the water absorbing body 10 in the present embodiment. Here, FIG. 2A is a cross-sectional view showing the water absorbing body 10 before water absorption, and FIG.
Is a cross-sectional view showing the water absorbing body 10 after absorbing water.

Similarly to the first embodiment, the water absorbent body 10 has a water absorbent resin 13a,
13b, and is constituted by closing the entrance of the water-permeable bag-like body 12. As described above, the difference from the first embodiment is that the water absorbent resins 13a and 13b have a specific gravity of 1%.
This is the point that the solid matter 14 is contained therein.

As the solid material 14, for example, a material having magnetism can be used. Examples of those having magnetism include those having ferromagnetism, ferrimagnetism, and parasitic magnetism. As described above, by incorporating the magnetic solid 14 therein, the water absorber 10 can be magnetically adsorbed, and can be transported by a crane or the like.
In addition, the magnetism makes it possible to identify the water absorber 10.

Examples of the ferromagnetic material include iron, nickel, cobalt, alloys thereof, alloys containing these, transition metals and alloys thereof, alloys containing rare earth elements, and the like. Examples of the ferrimagnetic material include magnetite, maghemite, hematite, manganese zinc ferrite, manganese nickel ferrite, barium ferrite, and strontium ferrite. These have a higher specific gravity than ordinary inorganic materials, can increase the weight of the water absorber 10, and can enhance the function of the water absorber 10 as a sandbag after absorbing water.
In addition, such a magnetic material is a material that is difficult to process in dismantling processing of electronic equipment, and is useful from the viewpoint of effective utilization.

As described above, in the present embodiment, the water absorbing resin 13
Since the solids 14 having a specific gravity of 1 or more are included in the a and 13b, the weight of the water absorber 10 can be increased, and the function as a sandbag can be improved.

Further, by using a magnetic material as the solid material 14, the water absorbing body 10 can be easily identified, moved and transported, and the waste material of the electronic equipment can be effectively used.

[0064]

As described above, in the present invention, a polymer material containing at least one of styrene and a conjugated diene and acrylonitrile is acid-treated, and the product is finely divided into particles having an average particle diameter of 5 mm or less. The water-absorbent resin thus prepared is filled in the water-permeable bag to form a water-absorbent body, so that water remaining due to water leakage, submersion, etc. is absorbed and removed. Becomes possible.

The water-absorbent resin changes into a gel state by water absorption and increases in volume and weight while maintaining sufficient shape followability. While maintaining the above convenience, it is possible to perform a sufficient measure against flooding and the like at the time of actual use.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a water absorbing body according to a first embodiment. Here, (a) is a cross-sectional view showing a water-absorbing body before water absorption, and (b) is a cross-sectional view showing a water-absorbing body after water absorption.

FIG. 2 is a cross-sectional view illustrating a configuration of a water absorbing body according to a second embodiment. Here, (a) is a cross-sectional view showing a water-absorbing body before water absorption, and (b) is a cross-sectional view showing a water-absorbing body after water absorption.

[Explanation of symbols]

1, 10: water absorbent, 3a, 3b, 13a, 13b: water absorbent resin, 2, 12: water permeable bag, 14: solid

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08F 8/12 C08F 8/12 8/30 8/30 8/36 8/36 8/40 8/40 E02B 3/04 301 E02B 3/04 301 // B29K 55:02 B29K 55:02 (72) Inventor Tsutomu No. 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo F-term in Sony Corporation (reference) 2D018 AA06 4F100 AA00A AA00H AK74A AL07A AR00B AR00C BA03 BA06 BA10B BA10C CA18A CA18B CA18C CA20A CA23A DD32 GB90 JB05A JD05B JD05C JD15 JD15A JG06H JL11A JL15 JL15A JM10A4BC01A43 BC AM02P AS02Q BA35H BA41H BA56H BA63H DA37 HA08 HB44 HB50 HB52 HB57 HB58 JA67

Claims (15)

[Claims] 1. A water absorbent in which a water-absorbent resin is filled in a water-permeable bag, wherein the water-absorbent resin is obtained by acid-treating a polymer material containing at least one of styrene and a conjugated diene and acrylonitrile. A water-absorbent material, which is a modified polymer that is obtained by the above method and changes into a gel state by absorbing water, and the average particle size of the water-absorbing resin in a dry state is 5 mm or less. 2. The water-absorbent body according to claim 1, wherein the average particle size of the water-absorbent resin in a dry state is 1 mm or less. 3. The water absorber according to claim 1, wherein at least a part of the styrene, the conjugated diene and the acrylonitrile is a waste material. 4. The water absorbent according to claim 1, wherein the interior of the water-permeable bag and the water absorbent resin contain a surfactant. 5. The water absorber according to claim 1, wherein the polymer material contains an inorganic substance. 6. The water absorbent according to claim 1, wherein the polymer material contains a solid having a specific gravity of 1 or more. 7. The water absorbent according to claim 6, wherein the solid is a magnetic material. 8. The water-absorbent body according to claim 1, wherein after water absorption, the water-absorbent resin increases in volume and weight while keeping the shape following the outer shape. 9. A method for producing a water-absorbent body in which a water-absorbent resin is filled in a water-permeable bag, wherein a polymer material containing at least one of styrene and a conjugated diene and acrylonitrile is treated with an acid, A method for producing a water-absorbent material, wherein the water-absorbent resin obtained by the treatment is reduced to fine particles having an average particle size in a dry state of 5 mm or less. 10. The method for producing a water absorbent according to claim 9, wherein at least a part of said styrene, said conjugated diene and said acrylonitrile is made of a waste material as a starting material. 11. The method for producing a water absorbent according to claim 9, wherein said polymer material is made into small pieces before said acid treatment. 12. The method for producing a water absorbent according to claim 9, wherein a surfactant is contained in the inside of the water-permeable bag and the water absorbent resin. 13. The method according to claim 9, wherein the polymer material contains an inorganic substance. 14. The method according to claim 9, wherein the polymer material contains a solid having a specific gravity of 1 or more. 15. The method according to claim 14, wherein the solid is a magnetic material.