JP2001081752A - Sandbag - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a sandbag product which is lightweight and does not have a large volume so as to be easily transported, and which functions as a sandbag by increasing in weight and volume when used. SOLUTION: A sandbag 10 is composed of a water-permeable hemp bag 12 woven with hemp yarn, and a granular water-absorbing organic polymer resin 14 filled as a filler in the hemp bag. The water-absorbing organic polymer resin is a granular modified polymer resin obtained by subjecting a waste ABS resin containing carbon black having a particle diameter of 40 μm at 0.5% by weight to a predetermined acid treatment. The sandbag is a factory product, and is light in weight and small in volume when the water-absorbing organic polymer resin is in a dry state when shipped from the factory. When the sandbag is installed at the breakwater of the embankment and comes into contact with water, the water-absorbing organic polymer resin naturally absorbs water to increase the weight and volume, and becomes a weight and a volume that can function sufficiently as a sandbag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sandbag, and more particularly, to prevent a levee from breaking by raising a levee when the water level of a river rises in a flood or the like. In particular, it relates to sandbags that are most suitable for repairing breakwaters of embankments.

[0002]

2. Description of the Related Art Sandbags are civil engineering materials made by putting a filling material such as earth and sand in a sturdy bag such as a hemp bag. The sandbags are used to raise a dike in order to prevent flooding of rivers, lakes and marshes during floods. Or used to block the breach of a breached embankment. In addition, at a digging site where a hole is dug in a soil layer, it is often used for earth retaining and the like. Since sandbags require a certain bulk and weight in order to prevent them from moving against water pressure or the like, the sandbags are large in volume and heavy.

[0003] By the way, sandbags are heavy and bulky, so that they must be manufactured as a sandbag product in a remote place and transported to a use site using a vehicle or the like. In addition, since it requires labor for transportation and unloading, it is not suitable for transportation. So, conventionally, sandbags are important civil engineering materials needed in the event of a disaster, but when a disaster occurs,
It is made by hand by filling the bag with earth and sand as needed.

[0004]

As described above, sandbags are conventionally manufactured by a human near a disaster occurrence site at the time of occurrence of a disaster, as described above, because they are heavy and bulky. However, this has a problem in that the production efficiency is extremely low, and the necessary number of sandbags cannot be satisfied in the event of a disaster. That is, sandbags are materials necessary to protect the lives and properties of residents in the event of an emergency such as a flood, and it is important that the sandbags be easily and promptly applied. Therefore, in place of a handmade sandbag, a sandbag that is small in weight and volume and is easily manufactured and transported so that it can be used promptly in an emergency, and the weight of the sandbag increases when used, is required. I have.

[0005] For the above reasons, the present invention is lightweight and not bulky so that it can be easily transported. In addition, when used, it is not necessary to refill with filler such as earth and sand and the weight and volume increase. To provide a sandbag having a configuration suitable for factory production that functions as a sandbag.

[0006]

Therefore, the present inventor increases the weight and volume by filling a water-permeable bag with an absorbent organic polymer resin and allowing the water-absorbent organic polymer resin to absorb water. With the idea of the sandbag thus constructed, the present invention was completed after experimentation.

To achieve the above object, a sandbag according to the present invention is a powdery or granular powder obtained by acid-treating an organic polymer material containing acrylonitrile and at least one of styrene and a conjugated diene. It is characterized in that a filling mainly composed of a water-absorbing organic polymer resin is filled in a water-permeable bag.

[0008] Preferably, the water-absorbing organic polymer resin is obtained by acid-treating a waste organic polymer material containing acrylonitrile and at least one of styrene and conjugated diene as a starting material. . Thereby, the waste material which has been conventionally disposed can be effectively used.

In the present invention, a polymer (organic polymer material) containing acrylonitrile and at least one of styrene and conjugated diene as constituent units is converted to a modified polymer resin by acid treatment under predetermined conditions. The obtained water-absorbing organic polymer resin is used as a main component of the sandbag filler. That is, by the acid treatment under the conditions described below, a part of acrylonitrile in the organic polymer material is hydrolyzed, while ionic groups are introduced into styrene and conjugated diene, whereby the water-absorbing modified polymer resin is absorbed. Becomes Since the water-absorbing organic polymer resin exhibits a gel state due to water absorption, increases in weight and volume, and has a specific gravity greater than water, sandbags filled with the water-absorbing organic polymer resin are conventionally filled with bags filled with earth and sand. It functions as a civil engineering material similar to sandbags. Further, since the sandbag according to the present invention absorbs water and increases in volume and weight, the sandbag has sufficient shape followability required for stacking the sandbags, and becomes a sandbag which is hard to collapse even when stacked.

Material of Water-absorbing Organic Polymer Resin The starting material of the water-absorbing organic polymer resin is an organic polymer material containing acrylonitrile and at least one of styrene and conjugated diene. The organic polymer material contains acrylonitrile units in an amount of 5 mol% to 80 mol%, preferably 10 mol% to 60 mol%, more preferably 20 mol% to 60 mol%.
It is desirable that the content be in the range of not less than 50 mol% and not more than mol%. Acrylonitrile unit content is 5 mol%
If the amount is less than the above range, the compound shows water solubility upon acid treatment and is not suitable as a water-absorbing resin. On the other hand, if it exceeds 80 mol%, the resin becomes hard and difficult to pulverize into small pieces, or the content of at least one of styrene and conjugated diene in the material decreases, and the introduction ratio of ionic groups decreases. I do. As a result, the water-absorbing effect, particularly the water-absorbing effect on the aqueous electrolyte solution, is undesirably reduced.

The organic polymer material contains at least one of styrene and a conjugated diene as a structural unit other than acrylonitrile in an amount of 20 mol% to 95 mol%, preferably 4 mol% or less.
Desirably, the content is in the range of 0 mol% to 85 mol%, more preferably, 50 mol% to 80 mol%. The conjugated diene is, for example, butadiene, isoprene and the like. At least one of styrene and a conjugated diene is necessary for introducing an ionic acidic group into the organic polymer material by performing an acid treatment, and absorbs water of the resulting modified polymer resin, particularly, absorbs water with respect to an aqueous electrolyte solution. It is necessary to improve the performance.

In addition, if acrylonitrile, styrene and conjugated diene are contained in predetermined amounts, another constituent unit may be further contained in the resin waste material. These other structural units include maleic anhydride, itaconic anhydride,
α-methylstyrene, acrylamide, methacrylamide, acrylic acid, and acrylate (carbon number:
1 to 10 saturated and unsaturated hydrocarbons), methacrylic acid and methacrylate (carbon number: 1 to 1)
0 or less saturated and unsaturated hydrocarbons), vinyl acetate, vinyl chloride, ethylene, propylene, butylene, vinyl pyrrolidone, vinyl pyridine and the like.

The molecular weight of the organic polymer material as a starting material of the water-absorbing organic polymer resin is represented by a weight average molecular weight (Mw),
1,000 or more and 20,000,000 or less, and even 1
The range from 0000 to 1,000,000 is common. When the weight-average molecular weight is lower than 1,000, it becomes water-soluble at the time of acid treatment, and the desired water-absorbing organic polymer resin cannot be obtained. If the weight-average molecular weight is higher than 20,000,000, the reaction rate during the acid treatment becomes slow, so that it is not practical.

The organic polymer material containing acrylonitrile and at least one of styrene and a conjugated diene is preferably an ABS resin (acrylonitrile-
Butadiene-styrene resin). This is because a reaction product obtained by treating the ABS resin with an acid has a strongly acidic sulfonic acid group as an ionic group, and thus is excellent in water absorption as a water-absorbing organic polymer resin. Also, SAN resin (styrene-acrylonitrile resin), ASA resin (acrylonitrile-styrene-acrylate resin), ACS resin (acrylonitrile-chlorinated polyethylene-styrene resin), AAS resin (acrylonitrile-acryl-styrene resin), NBR (acrylonitrile-styrene resin) Organic polymer materials such as butadiene rubber) can be suitably used.

These resins may be newly-produced virgin pellets, discharged products (semi-products) in a resin raw material production process or a molded product molding process, or molded for a specific use. Alternatively, the used waste material may be used. The used waste material refers to, for example, a waste material such as a housing, various parts, a tube, a hose, and various cushioning materials used for an electric product, an automobile, or the like. The place of discharge may be any of factories, stores, households, etc., but those collected from factories, stores, etc. have relatively more composition than general waste from homes, etc. More desirable.

The organic polymer material may be an alloy with another resin, and may include a coloring pigment, a coloring paint, a stabilizer,
Waste materials containing additives such as flame retardants, plasticizers, fillers and other auxiliaries may be used. Further, a mixture of used waste material and virgin material may be used.

The other resin which can be mixed with the organic polymer material to form an alloy is preferably a resin which does not inhibit the acid treatment, and may be polyphenylene ether, polycarbonate, polyphenylene sulfide, polyethylene terephthalate, polybutylene terephthalate, polyamide ( Nylon), polyester and the like. These resins are desirably mixed at a content of 60% by weight or less based on the organic polymer material. The reason for this is that if the content of these resins increases, the reaction during the acid treatment will be inhibited.

Before the acid treatment of the organic polymer material, it is desirable to first crush the organic polymer material into small pieces of 3.5 mesh or less. If the size is larger than 3.5 mesh, the surface area becomes relatively small as compared with the size of the reactant participating in the acid treatment reaction, so that the acid treatment becomes difficult, so that the reaction time becomes long and is not practical. In addition, the performance (water absorption) of the water-absorbing resin is significantly reduced. There are the following methods for crushing into small pieces. The first crushing method is a method of crushing using a crusher and then sieving. In the case where the organic polymer material contains a rubber component, it is preferable to use this method for pulverization after the freezing treatment. The second crushing method is a method of melting by heating and then pelletizing into fine beads.

In the organic polymer material, carbon black,
When an inorganic substance such as titanium oxide is contained, the acid treatment is promoted, so that the water absorbing effect of the water absorbing resin is improved. The reason is that during the reaction of the acid treatment, the periphery of the inorganic pigment is acid-treated and the inorganic pigment easily comes off the organic polymer material, so that the surface of the organic polymer material becomes a porous surface and the acid becomes organically high. This is because it easily permeates into the molecular material. Carbon black, titanium oxide, and the like may be those originally contained in the organic polymer material, or may be separately added to and mixed with the organic polymer material.
In addition, in terms of improving the water absorption performance of the water-absorbing organic polymer resin obtained by converting the organic polymer material into a modified polymer resin, an organic polymer material containing carbon black, titanium oxide, etc. is originally used. It is more preferable that carbon black, titanium oxide and the like are uniformly and uniformly dispersed. Carbon black, titanium oxide, etc. are plastic colorants, reinforcing agents,
What is generally used as an electrical conductivity imparting agent may be used. The content of inorganic substances such as carbon black and titanium oxide contained in the organic polymer material is 0.1 to the dry weight.
0.01% by weight or more and 20% by weight or less, preferably 0.0% by weight or less.
The range is 5% by weight or more and 10% by weight or less.

The carbon black may be produced by any of a channel method, a furnace method, and a thermal method, and may be produced alone or in combination of a plurality of methods. The average particle size of the carbon black is 5 μm or more and 500 μm or less, preferably 10 μm or less.
It is not less than μm and not more than 50 μm.

Titanium oxide is a rutile type, an anatase type,
Any type of ultrafine titanium particles may be used, and each may be used alone or in combination. The average particle diameter of titanium oxide is 0.01 μm or more and 50 μm or less,
Preferably, it is in the range of 0.05 μm or more and 10 μm or less.

Acid Treatment of Organic Polymer Material The acid used in the acid treatment of the present invention is preferably an inorganic acid.
The amount of the inorganic acid charged is in the range of 1 to 500 times, preferably 10 to 200 times the weight of the organic polymer material to be subjected to the acid treatment. If the addition amount of the inorganic acid is less than 1, the introduction rate of the ionic group of styrene or conjugated diene or the hydrolysis rate of the acrylonitrile group will decrease, and the water absorbing property of the water-absorbing organic polymer resin will decrease. Further, when the addition amount of the inorganic acid is more than 500 times,
It is necessary to neutralize the excess inorganic acid, which is disadvantageous both economically and operationally.

Examples of the inorganic acid used in the acid treatment include a sulfonating agent such as concentrated sulfuric acid, sulfuric anhydride, fuming sulfuric acid and chlorosulfonic acid, and nitric acid, fuming nitric acid, phosphoric acid, phosphorus chloride, phosphorus oxide and the like. Among these, concentrated sulfuric acid, sulfuric anhydride,
Fuming sulfuric acid and chlorosulfonic acid are preferred, and concentrated sulfuric acid of 70% by weight or more is particularly preferred.

The inorganic acids may be used alone or in combination of two or more. When used in combination, they may be mixed or added sequentially. For example, by first treating an organic polymer material with concentrated sulfuric acid and then adding sulfuric anhydride, a water-based, water-stable organic polymer resin having a stable shape can be obtained. This is because the treatment with concentrated sulfuric acid first hydrolyzes mainly the nitrile portion in the organic polymer material, and then the treatment with sulfuric anhydride causes styrene and conjugated dienes to be forcibly sulfone-crosslinked. This is because a water-absorbing resin having a high degree of crosslinking can be obtained.

The acid treatment may be performed in an inorganic acid, or may be performed in a reaction system using an organic solvent. As the organic solvent usable as the reaction system, a C ₁ or C ₂ aliphatic halogenated hydrocarbon, preferably 1,2-dichloroethane, chloroform, dichloromethane, 1,1-dichloroethane, an aliphatic cyclic hydrocarbon, preferably , Cyclohexane, methylcyclohexane and cyclopentane. In addition, nitromethane, nitrobenzene, sulfur dioxide, paraffinic hydrocarbons having 1 to 7 carbon atoms, acetonitrile, carbon disulfide, tetrahydrofuran, tetrahydropyran, 1,2-dimethoxyethane, acetone, methyl ethyl ketone, thiophene and the like can be mentioned.
Preferably, aliphatic halogenated hydrocarbons C ₁ or C _2, alicyclic hydrocarbons, nitromethane, nitrobenzene, and sulfur dioxide.

These solvents may be used alone or as a mixture of a plurality of types. In the mixing between the above-mentioned solvents, the mixing ratio is not particularly limited. The amount of these organic solvents is preferably less than 200 times the weight of the organic polymer material. If the addition amount of the organic solvent is larger than this, the reaction rate of the acid treatment becomes low, and the cost of the organic solvent increases, which is economically disadvantageous.

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

According to the present invention, an organic polymer material is subjected to an acid treatment to introduce an ionic group into styrene and a conjugated diene unit, while an acrylonitrile unit is hydrolyzed and amidated to form an organic polymer material. The material is converted to a modified polymer resin and used as a water-absorbing organic polymer resin. By acid treatment, as the ionic group to be introduced into the styrene and conjugated diene units, sulfonic acid and its salts, -PO (OH) ₂ and salts thereof, -CH ₂ P
O (OH) ₂ and its salts, can be mentioned -NO _2.

When a sulfonic acid group is introduced as an ionic group, the organic polymer material is reacted with a sulfonating agent such as concentrated sulfuric acid, sulfuric anhydride, fuming sulfuric acid, chlorosulfonic acid or the like, or in a solvent. Also, -PO (O
H) To introduce _two groups, add phosphorus trioxide in a solvent,
It is made possible by further hydrolysis. Alternatively, a —NO ₂ group can be introduced into the organic polymer material by reacting with a mixed solution of sulfuric acid and nitric acid.

Of these ionic groups, sulfonic acid and its salts are preferred. These ionic groups may be used alone or two or more of them may be introduced into the organic polymer material. However, in order to improve the water-absorbing performance of the water-absorbing resin, the amount of the ionic group contained in the organic polymer material should be 5 mol% or more and 95 mol% with respect to all units.
Or less, preferably in the range of 10 mol% or more and 70 mol% or less. If the rate of introduction of ionic groups is more than 95 mol%, the reaction product obtained by acid-treating the organic polymer material shows water solubility, and cannot be used as a water-absorbing resin. On the other hand, if it is lower than 5 mol%, the water absorbing effect, particularly the water absorbing effect on the aqueous electrolyte solution, is reduced.

The acid treatment is performed under the following conditions,
It becomes possible to introduce a predetermined amount of ionic groups into the organic polymer material. The reaction temperature of the acid treatment varies greatly depending on whether or not an organic solvent is used, but is generally from 0 ° C to 200 ° C, preferably from 30 ° C to 120 ° C. If the reaction temperature is too low, the reaction rate becomes slow and impractical,
A water-absorbing resin having good water-absorbing performance cannot be obtained.
On the other hand, if it is too high, the molecular chains of the organic polymer material are easily broken by thermal decomposition, and are dissolved in water. The reaction time varies greatly depending on the reaction time, but is generally from 1 minute to 40 hours, preferably from 5 minutes to 2 hours. If the reaction time is too short, the reaction does not proceed sufficiently. Conversely, if the reaction time is too long, the production efficiency will deteriorate.

After the acid treatment, it is preferable to wash the water-absorbing organic polymer resin as a reaction product. As a method of washing the reaction product, the reaction system is directly introduced into a large amount of water or a basic aqueous solution, or the reaction product obtained by filtering the reaction system with a filter or the like is converted into a large amount of water or a basic aqueous solution. There is a method of inputting. By the washing, the nitrile group in the organic polymer material is converted into an amide group, a carboxyl group, or a salt of the carboxyl group. Examples of the basic substance used in the basic aqueous solution include oxides, hydroxides, carbonates, acetates, and sulfates of alkali metals such as sodium, lithium, and potassium, and alkaline earth metals such as magnesium and calcium. , Phosphates and the like. However, in order to improve the absorption effect of the water-absorbing organic polymer resin, particularly the water-absorbing effect on the aqueous electrolyte solution, it is desirable to perform only water washing without neutralization.

The reaction product obtained through the above steps is
It is a gel-like substance, which is then sun dried, heat dried,
Drying under reduced pressure, or centrifugal dehydration, press dehydration, etc.,
The desired water-absorbing organic polymer resin can be obtained. By the treatment method described above, a water-absorbing organic polymer resin having a nitrile group, a hydrolyzate thereof, and an ionic group can be obtained. The water-absorbing organic polymer resin has an unreacted nitrile group in the acid treatment, thereby improving water-insolubility and gel strength.Also, a hydrolyzate of the nitrile group, and a water-absorbing ionic group, particularly It is considered that the water absorption of the aqueous electrolyte solution is enhanced.

The type and form of the water-permeable bag used in the present invention are not limited as long as it is water-permeable. For example, natural fiber or synthetic fiber cloth can be used as the material. it can. Examples of natural fibers include cotton, hemp, silk and the like. As synthetic fibers, polyamide, polyimide,
Examples include polyester, polyethylene, and polypropylene. It is preferable that these fibers are used alone or as a mixture and woven into a cloth. In addition, a nonwoven fabric may be used. Further, it may be formed of a film-shaped body whose front and back are penetrated by pores.

With the above configuration, the weight and volume are small during transportation, and the weight and volume increase due to water absorption of the water-absorbing organic polymer resin during use, and the sandbag has high external shape followability. Can be provided as factory products. In addition, by recycling polymer waste materials or inorganic solid waste materials that have been difficult to treat as wastes, it is possible to contribute to the global environment.

Sandbag Containing Solid as Part of Filling In a preferred embodiment of the present invention, the filling comprises, in addition to the water-absorbing organic polymer resin, a particle size of 0.01 mm to 100 m
m and a solid matter having a specific gravity of 1 or more. Solids are at least one of minerals collected or mined from nature and / or waste. In addition, the solid material is formed by binding waste. Further, the solid material is made of magnetic waste. The solid content is preferably 1% by weight or more and 99% by weight or less of the whole dry filling.

The solids used as a part of the packing in the present invention include gravel, pebbles, and pebbles collected or mined from the natural world.
Minerals including sand and the like, wastes, and those formed by binding wastes are also included. Examples of the solid material include metal, ceramics, glass, and those obtained by binding these to each other. As the binder at the time of binding, a binder made of a polymer material, for example, an epoxy resin-based adhesive can be used.

Further, in the present embodiment, a solid material having magnetism can be used. Those having magnetism include those having ferrimagnetism, ferromagnetism, and parasitic magnetism. Due to the magnetic properties of the solid matter, the sandbags attract each other due to the magnetic force during transport and transportation, so that handling with a crane or the like becomes easy. Also, the magnetism enables the sandbag to be identified. When a ferromagnetic material is used as a solid having magnetism, for example, iron, nickel, cobalt, alloys containing these or alloys containing these, further, transition metals and alloys thereof, further containing rare earth elements Alloys can be mentioned. Furthermore, examples of ferrimagnetic materials include magnetite, maghemite, manganese zinc ferrite, manganese nickel ferrite, barium ferrite, and strontium ferrite.

Since these materials have a specific gravity higher than that of general inorganic materials, the weight of the sandbag can be increased, and even if the sandbag is in a water-absorbing state, the sandbag has an effect of relatively increasing the weight. Further, these magnetic materials are waste materials that are difficult to dispose in dismantling processing of electronic equipment, and are useful from the viewpoint of effective utilization.

[0040]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Embodiment 1 This embodiment is an example of an embodiment of a sandbag according to the present invention. FIG. 1A is a cross-sectional view of the sandbag of Embodiment 1 at the time of shipment, and FIG. It is sectional drawing at the time of use of a sandbag.
As shown in FIG. 1A, the sandbag 10 of the present embodiment is
A water-permeable bag-like body 12 and a granular water-absorbing organic polymer resin 14 filled as a filler in the water-permeable bag-like body 12 are provided. The water-permeable bag-like body 12 is a hemp bag woven with hemp yarn. The water-absorbing organic polymer resin 14 has an average particle diameter of 40
μm carbon black at 0.5% by mass,
Mole% acrylonitrile, 15 mole% butadiene,
It is a granular modified polymer resin obtained by subjecting a waste ABS resin composed of styrene and 50 mol% to an acid treatment as described above.

The sandbag 10 of this embodiment is a product manufactured in a factory, and when shipped from the factory, the water-absorbing organic polymer resin 14 does not absorb water as shown in FIG. Dry, lightweight and small in volume. Sandbag 10
Is installed, for example, at the breakwater of a dike and comes into contact with water,
The water-absorbing organic polymer resin 14 naturally absorbs water to increase the weight and volume, and as shown in FIG. 1 (b), becomes a weight and volume that sufficiently functions as a sandbag. When the water-absorbing organic polymer resin 14 absorbs water, the sandbag 10 increases in weight and volume by about 300 times as compared to the dry state of the water-absorbing organic polymer resin 14.

Embodiment 2 This embodiment is another example of the embodiment of the sandbag according to the present invention. FIG. 2A is a sectional view of the sandbag of Embodiment 2 at the time of shipping, and FIG. FIG. 2B is a sectional view when the sandbag is used. As shown in FIG. 1 (a), the sandbag 20 of the present embodiment has a structure in which the filler filled in the water-permeable bag-like body 12 is composed of the granular water-absorbing organic polymer resin 14 and the whole dry filler. It has the same configuration as the sandbag 10 of the first embodiment except that it is composed of a granular inorganic solid substance 22 mixed at 90% by weight with respect to the sandbag. The inorganic solid substance 22 has a particle size of 2 mm or more and 10 mm or more.
It is made of a manganese nickel ferrite solid having a specific gravity of 1 or more and a specific gravity of 1 mm or less.

The sandbag 20 of the present embodiment, when used,
As shown in FIG. 2B, since the water-absorbing organic polymer resin 14 absorbs water and increases in weight and volume, the same effect as that of the sandbag 10 of the first embodiment is provided. Therefore, during transportation, the sandbags attract each other due to the magnetic force of the manganese nickel ferrite solid 22,
Handling by a crane or the like becomes easy. Also, the magnetism enables the sandbag to be identified.

[0044]

As described above, according to the present invention, a water-absorbing organic polymer resin is filled in a water-permeable bag as a main filler, so that a sandbag for a factory product manufactured in a factory can be obtained. At the time of shipment from the factory, the water-absorbing organic polymer resin is in a dry state where it does not absorb water, and is a light-weight, small-sized sandbag. Then, the water-absorbing organic polymer resin naturally absorbs water to increase weight and volume,
The weight and volume are sufficient to function as sandbags. Further, in the present invention, the water-absorbing organic polymer resin can be made of a used organic polymer material. Therefore, by using the polymer waste material or the inorganic solid waste material, which has been difficult to treat as waste, it is possible to contribute to solving the problem of waste treatment and to contribute to the preservation of the global environment.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a sandbag according to a first embodiment at the time of shipment, and FIG. 1B is a cross-sectional view of the sandbag when the sandbag is used.

FIG. 2A is a cross-sectional view of the sandbag according to the first embodiment when the sandbag is shipped, and FIG. 2B is a cross-sectional view when the sandbag is used.

[Explanation of symbols]

10: sandbag of Embodiment 1; 12: water-permeable bag-like body; 14: granular water-absorbing organic polymer resin; 20: sandbag of Embodiment 2; 22: inorganic solid material.

Claims (6)

[Claims] 1. A filler mainly composed of a powdery or granular water-absorbing organic polymer resin obtained by acid-treating an organic polymer material containing acrylonitrile and at least one of styrene and conjugated diene. Is filled in a water-permeable bag. 2. The water-absorbing organic polymer resin is obtained by acid-treating a waste organic polymer material containing acrylonitrile and at least one of styrene and conjugated diene as a starting material. The sandbag according to claim 1. 3. The filler, in addition to the water-absorbing organic polymer resin, has a particle size of 0.01 mm to 100 mm and a specific gravity of 1 to 3.
The sandbag according to claim 1, comprising the above solid matter. 4. The sandbag according to claim 3, wherein the solid material is at least one of a collected or mined mineral and a waste. 5. The sandbag according to claim 4, wherein the solid material is formed by binding waste. 6. The sandbag according to claim 4, wherein the solid material is made of magnetic waste.