JP6553932B2 - Waste liquid solidifying agent, its production method and its use - Google Patents

Description

  The present invention relates to a particulate waste liquid solidifying agent mainly composed of a water-absorbing resin, a production method thereof and use thereof. More specifically, the present invention relates to a particulate waste solution solidifying agent which uniformly solidifies waste liquid, particularly medical waste liquid containing blood, body fluid and the like, and shortens the setting time remarkably, a method for producing the same and its use.

  In recent years, waste liquid discharged from various industrial fields has been increasing. Waste liquids include factory waste liquids, beverage waste liquids, body fluid waste liquids, etc. Liquid medical waste liquids containing amniotic fluid and blood, etc., which are discharged especially during hospital surgery and childbirth, are used by healthcare professionals and disposal companies. In order to prevent infectious diseases against the above, after being collected in a waste liquid container, it is treated in a septic tank after incineration or chemical treatment. However, in any case, if treated in liquid form, there is a risk of damage to the waste liquid container due to an accident etc., or secondary infection due to scattering of the waste liquid, so solidify the waste liquid, especially medical waste liquid (gelation It is desirable to process after it is also called. That is, there is a demand for a waste liquid treatment method in which the waste liquid is solidified into a gel by introducing a treatment agent into the waste liquid.

  Medical waste fluid here refers to blood and body fluids, 0.9% by weight sodium chloride aqueous solution (physiological saline) mixed solution, Ringer's solution waste solution for washing the affected area, disinfectant ethanol waste solution, other disinfectant waste solution, artificial solution Examples include dialysis waste liquids, organs containing body fluids such as blood extracted from patients, pathological examination waste liquids, and the like. In the waste liquid treatment agent for solidifying these medical waste liquids, some methods (patent documents 1, 2 etc.) for preventing the water absorption performance fall of water absorbent resin by the electrolyte contained in blood, body fluid, etc. Proposed. Patent Document 1 is a blend of an ionic water-absorbing resin and a nonionic water-absorbing resin. In Patent Document 2, a substance that reduces the ionic strength of the electrolyte contained in the waste liquid, such as a chelating agent, an ion exchange resin, an ion sensitive substance, etc., is blended with the water absorbing resin.

  However, in the method of Patent Document 1, although the nonionic water-absorbing resin is not easily affected by the electrolyte, since the original water absorption speed is slow, in order to solidify the waste liquid, a large amount of solidification time is required, or the water absorption It is necessary to use a large amount of resin. Furthermore, a process for blending two types of water-absorbing resins is also required, leading to problems of non-uniform blending and an increase in manufacturing price. Furthermore, even if it was possible to prevent the water absorption performance of the water-absorbent resin from being deteriorated by the electrolyte in Patent Documents 1 and 2, etc., there were more serious problems depending on the method of solidification of the waste liquid Specifically, various container shapes (longitudinal, horizontal, etc.) and a method of charging the solidifying agent (batch charging / split charging into the waste liquid, pre-loading into the solution / post charging), etc. have been proposed as solidification methods for the waste liquid. However, from the viewpoint of processing space, there is a case where the waste liquid is stored in a vertically long container.

  That is, in order to solidify waste liquid collected in a vertically long waste liquid container, especially medical waste liquid, when the water absorbent resin is put into the waste liquid at once, most water absorbent resin does not float on the bottom of the container due to the difference in specific gravity between them. It sinks, and then solidification proceeds toward the upper waste liquid. For this reason, the distribution of the water-absorbent resin after completion of solidification is distributed at a high concentration at the bottom of the container, and a part of the water-absorbent resin becomes like a mummy, and all the water-absorbent resin is not used It may be in a state. Therefore, the concentration of the water-absorbent resin necessary for absorbing the waste liquid in the upper part of the container is low, and there is a problem of non-uniform solidification that it is difficult to reach a sufficient solidified state in the upper part of the waste container. As a result, when the solidifying agent is put into the waste liquid in the waste liquid container which is long in a batch as a method of solidifying the waste liquid, in order to solidify the whole waste liquid, It is impossible to prevent deterioration of water absorption performance or just increase the water absorption capacity of the water-absorbent resin. When using a general water-absorbent resin as a solidifying agent, the solidification time becomes longer or a large amount of waste liquid solidifying agent is required. Met.

  Therefore, in Patent Document 3, by mixing the hydrophobic material with the waste liquid solidifying agent containing the water absorbing resin, part of the waste liquid solidifying agent floats, and the remaining liquid settles, thereby shortening the solidifying time. It has been proposed that

  However, the solidification time of the waste liquid may still be insufficient for a long time due to the fact that the solidification agent can not maintain the floating state well even by this method, or a relatively large amount of solidification agent is still required for solidification. It is said that.

Japanese Patent Laid-Open No. 2002-119853 JP 11-169451 A Japanese Patent Application Publication No. 2007-538110

  The present invention has been made in view of the above problems, and the problem to be solved by the present invention is: waste liquid, particularly medical waste liquid containing blood, body fluid, etc., inexpensively, uniformly, in extremely short time Another object of the present invention is to provide a waste liquid solidifying agent that can be solidified with a relatively small amount of use. In particular, it is an object of the present invention to provide a waste liquid solidifying agent capable of uniformly solidifying medical waste liquid containing waste liquid, particularly blood, body fluid and the like in an extremely short time in a longitudinally long waste liquid container.

  The inventor of the present invention can prevent the water absorption performance of the water-absorbent resin from being lowered by the conventional electrolyte, and the solidification time still has room for improvement even by adjusting the ratio of floating to sedimentation of the solidifying agent The waste liquid solidifying agent which shows more optimal solidification behavior was studied earnestly.

  As a result, in order to solidify the waste liquid uniformly and in a short time, the present inventors assume that a part of the waste liquid solidifying agent containing the water absorbent resin is settled and part is floated, and the solidified waste liquid is solidified The balance of solidification from the top and the bottom of the container is made optimal by swelling at least a part of the agent while settling and at least a part of the suspended waste solution solidifying agent while floating without swelling. It has been found that the solidification time is remarkably shortened or leads to a reduction in the amount used, and for this purpose, the waste liquid solidifying agent is hydrophobic to exhibit a specific property in a water absorbent resin whose particle size is adjusted to a specific range The present inventors have found that it is necessary to contain a substance and a hydrophilic substance, and solved the above problems.

That is, the waste liquid solidifying agent according to the present invention is a particulate solidifying agent used in a method of treating a waste liquid which solidifies the waste liquid into a gel by charging the solidifying agent into the waste liquid.
Waste liquid containing a water-absorbent resin having a weight average particle diameter of 200 μm to 350 μm, and a hydrophobic substance and a hydrophilic substance having a methanol index of 100% or more with respect to the water-absorbent resin of 0.05% to 5% by weight It is a solidifying agent.

  Alternatively, the method for producing a waste liquid solidifying agent according to the present invention is a method for producing the particulate solidifying agent used in a method for treating a waste liquid which solidifies the waste liquid into a gel form by adding a treatment agent to the waste liquid. The production method is based on 0.05 to a water-absorbent resin particle having a crosslinked structure obtained by polymerizing a monomer containing acrylic acid and a salt thereof as a main component and the surface of which is crosslinked. Mixing a hydrophobic substance having a methanol index of 100% or more to 5.0% by weight and a hydrophilic substance of 0.3% to 3.0% by weight, and the water-absorbent resin particles having a weight-average particle size A method for producing a waste liquid solidifying agent, wherein the diameter is adjusted to 200 μm or more and 350 μm or less.

  According to the present invention, when the waste liquid is solidified, gel growth occurs from above and below, so that the solidification time can be remarkably shortened. The waste liquid solidifying agent of the present invention is obtained from specific water-absorbent resin particles, a specific hydrophobic substance and a hydrophilic substance.

  Hereinafter, an embodiment of the present invention will be described as follows, but the present invention is not limited to this.

(I) Water-absorbing resin First, the water-absorbing resin in the present invention will be described. The "water-absorbent resin" in the present invention refers to a water-swellable water-insoluble polymer gelling agent, and refers to those satisfying the following physical properties. That is, CRC (centrifuge holding capacity) defined by ERT 441.2-02 as water swellability is 5 g / g or more, and Ext (water soluble fraction specified by ERT 470.2-02 as water insoluble) ) Refers to a polymer gelling agent satisfying 50% by weight or less.

  The water-absorbent resin can be designed according to its use and purpose, and is not particularly limited, but is preferably a hydrophilic crosslinked polymer obtained by crosslinking and polymerizing an unsaturated monomer having a carboxyl group. Moreover, it is not limited to the form whose whole quantity is a crosslinked polymer, The composition containing the additive etc. may be sufficient in the range with which the said physical property (CRC, Ext) is satisfy | filled.

  Furthermore, the water-absorbent resin in the present invention is not limited to the final product before shipping (sometimes referred to as a water-absorbing agent or a water-absorbing material), but an intermediate (for example, a water-containing gel after polymerization) in the production process of the water-absorbent resin. In some cases, it refers to a crosslinked polymer, a dried polymer after drying, a pulverized polymer after pulverization, a water-absorbent resin powder before surface cross-linking, etc.), all of which are collectively referred to as "water-absorbent resin".

  In the present invention, from the viewpoint of absorption characteristics, one or a mixture of water-absorbent resins having a cross-linked structure obtained by polymerizing a water-soluble ethylenically unsaturated monomer is essentially used as the water-absorbent resin. From the viewpoint of speed, it is preferable that the water-absorbent resin is preferably obtained from a water-soluble ethylenic unsaturated monomer containing an acid group, particularly a carboxyl group, and more preferably acrylic acid and / or a salt thereof A partially neutralized polyacrylic acid polymer obtained by polymerizing / crosslinking a monomer having a main component (Japanese product) as a main component is preferable. In addition, when using a water-absorbent resin obtained from a water-soluble ethylenic unsaturated monomer containing an acid group, a nonionic water-absorbent resin such as a polyethylene oxide cross-linked product, or a polyethylene imine cross-linked product to improve salt resistance etc. And the like may be used in combination with a cationic water-absorbing resin.

(1) Water-soluble ethylenic unsaturated monomer As the water-soluble ethylenic unsaturated monomer (hereinafter simply referred to as monomer), it is preferable to use acrylic acid and / or a salt thereof as the main component. And other monomers may be used in combination, or a water absorbing resin may be obtained with other monomers as the main component. Besides acrylic acid, examples of the monomer include methacrylic acid, (anhydride) maleic acid, fumaric acid, crotonic acid, itaconic acid, vinylsulfonic acid, 2- (meth) acrylamido-2-methylpropanesulfonic acid, (meth) Acryloxyalkanesulfonic acid and its alkali metal salts, acid group-containing unsaturated monomers such as ammonium salts, N-vinyl-2-pyrrolidone, N-vinylacetamide, (meth) acrylamide, N-isopropyl (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, methoxy polyethylene glycol (meth) acrylate, polyethylene glycol (meth) acrylate, N, N-dimethyl (meth) acrylamide, isobutylene, lauryl (meth) acrylate and the like. Among these, those which are not water soluble (hydrophobic unsaturated monomers) can also be used as copolymerization components.

  When acrylic acid (salt) is used in the present invention, the monomer other than the acrylic acid (salt) is preferably 0 to 30 moles relative to the total amount of acrylic acid used as the main component and its salt. %, More preferably 0 to 10 mol%. If it is this range, in addition to solidification time, while providing other functions, such as an antibacterial and deodorizing, a waste liquid solidification agent can be obtained further cheaply. When an acid group-containing unsaturated monomer is used as the monomer, at least a portion is preferably neutralized from the viewpoint of solidification time, and alkali metal salts and alkaline earth metals as the salt thereof are preferable. Salts and ammonium salts can be mentioned. From the viewpoints of the performance of the water-absorbing resin obtained, industrial availability, safety, etc., sodium salts and potassium salts are particularly preferred. The neutralization ratio of the acid groups (mol% of the acid groups neutralized among the total acid groups) is preferably 10 to 100 mol%, more preferably 30 to 90 mol%, still more preferably 40 to 80 mol. %. In order to form the above-mentioned salt, it may be neutralized in the form of a monomer, or a non-neutralized monomer and a neutralized monomer may be mixed, and in the course of polymerization of the monomer. Or you may neutralize as a polymer after superposition | polymerization and you may use them together.

(2) Crosslinkable monomer (internal crosslinking agent)
The water-absorbent resin requires a cross-linked structure. The water-absorbing resin may be a self-crosslinking type that does not use a crosslinkable monomer. However, two or more polymerizable unsaturated groups or two or more reactive groups are contained in one molecule. What copolymerized or reacted the crosslinking | crosslinked monomer (it is also called the internal crosslinking agent of water absorbing resin) which it has is further more preferable. The internal cross-linking agent may be used alone, or may be used in combination of two or more as appropriate, or may be added all at once to the reaction system before, during, or after polymerization. Also good. When at least one or more internal crosslinking agents are used, they have two or more polymerizable unsaturated groups in consideration of the absorption properties of the finally obtained water-absorbent resin and waste liquid solidifying agent, etc. It is preferable to use the compound essentially during polymerization.

  As the internal crosslinking agent used in the present invention, the compounds described in US Pat. No. 6,241,928 are also applied to the present invention. From these, one or more compounds are selected in consideration of reactivity.

  The amount of the internal crosslinking agent used is preferably 0.0001 to 10 mol%, more preferably 0.001 to 1 mol%, based on the entire monomer. By making the amount used within the above range, a desired water-absorbent resin can be obtained. When the amount used is too small, the gel strength tends to decrease and the water soluble component tends to increase. When the amount used is too large, the water absorption capacity tends to decrease, which is not preferable.

  In the present invention, a method in which a predetermined amount of an internal cross-linking agent is previously added to the monomer aqueous solution and a cross-linking reaction is performed simultaneously with the polymerization is preferably applied. On the other hand, other than the above method, a method of post-crosslinking by adding an internal crosslinking agent during or after polymerization, a method of radical crosslinking using a radical polymerization initiator, radiation using an active energy ray such as electron beam or ultraviolet ray A crosslinking method or the like can also be employed. Moreover, these methods can also be used together.

(3) Polymerization initiator The polymerization initiator used in the present invention is not particularly limited because it is appropriately selected depending on the polymerization form and the like. For example, a thermal decomposition polymerization initiator, a photodecomposition polymerization initiator, or these The redox type polymerization initiator etc. which used together the reducing agent which promotes decomposition | disassembly of the polymerization initiator of this are mentioned. Specifically, one or more of the polymerization initiators disclosed in US Pat. No. 7,265,190 are used. From the viewpoint of handling of the polymerization initiator and physical properties of the water-absorbent resin, a peroxide or an azo compound is preferably used, more preferably a peroxide, and still more preferably a persulfate.

The amount of the polymerization initiator used is preferably 0.001 to 1 mol%, more preferably 0.001 to 0.5 mol%, based on the monomer. The amount of the reducing agent used is preferably 0.0001 to 0.02 mol% relative to the monomer.
The polymerization reaction may be carried out by irradiating an active energy ray such as radiation, electron beam or ultraviolet ray instead of the above-mentioned polymerization initiator, and these active energy ray and the polymerization initiator may be used in combination.

(4) Polymerization method The polymerization method applied to the present invention is not particularly limited, but preferably spray droplet polymerization, aqueous solution polymerization, reverse phase suspension polymerization, from the viewpoint of water absorption characteristics, ease of polymerization control, etc. More preferred are aqueous solution polymerization, reverse phase suspension polymerization, and still more preferred aqueous solution polymerization. Among them, continuous aqueous solution polymerization is particularly preferable, and any of continuous belt polymerization and continuous kneader polymerization can be applied.

  As specific polymerization forms, continuous belt polymerization is disclosed in U.S. Pat. Nos. 4,893,999 and 6,241,928 and U.S. Patent Application Publication No. 2005/215734, and continuous kneader polymerization is disclosed in U.S. Pat. Nos. 6,987,151 and 6,710,141. Each is disclosed. By adopting these continuous aqueous solution polymerizations, the production efficiency of the water absorbent resin is improved.

  Moreover, as a preferable form of the continuous aqueous solution polymerization, “high temperature initiation polymerization” and “high concentration polymerization” can be mentioned. The “high-temperature initiation polymerization” refers to polymerization at a temperature of the monomer aqueous solution of preferably 30 ° C. or more, more preferably 35 ° C. or more, still more preferably 40 ° C. or more, particularly preferably 50 ° C. or more (upper limit is boiling point) "High concentration polymerization" means that the monomer concentration is preferably 30% by weight or more, more preferably 35% by weight or more, still more preferably 40% by weight or more, particularly preferably 45% by weight or more The upper limit is a saturation concentration. These polymerization forms can also be used in combination.

  In the present invention, polymerization can also be carried out in an air atmosphere, but polymerization is preferably carried out in an inert gas atmosphere such as nitrogen or argon from the viewpoint of the color tone of the water-absorbent resin to be obtained. In this case, for example, it is preferable to control the oxygen concentration to 1% by volume or less. The dissolved oxygen in the monomer aqueous solution is also preferably replaced with an inert gas (for example, dissolved oxygen; less than 1 mg / l). Moreover, in this invention, it can also be set as foaming polymerization which superpose | polymerizes by disperse | distributing a bubble (especially said inert gas etc.) to monomer aqueous solution.

(5) Drying step The water-absorbent resin obtained after the above-described polymerization is usually a hydrogel crosslinked polymer, and is dried as necessary, and usually pulverized before and / or after drying.
This step is a step of drying the particulate water-containing gel obtained in the above-mentioned polymerization step and / or gel grinding step to a desired resin solid content to obtain a dried polymer. The resin solid content is determined from loss on drying (weight change when 1 g of a water absorbing resin is heated at 180 ° C. for 3 hours), preferably 80% by weight or more, more preferably 85 to 99% by weight, still more preferably 90. It is -98 weight%, Most preferably, it is 92-97 weight%.

  The method for drying the particulate water-containing gel is not particularly limited. For example, heat drying, hot air drying, reduced pressure drying, fluidized bed drying, infrared drying, microwave drying, drum dryer drying, azeotrope with a hydrophobic organic solvent Drying by dehydration, high humidity drying using high temperature steam and the like can be mentioned. Among these, hot air drying is preferable from the viewpoint of drying efficiency, and band drying in which hot air drying is performed on a ventilation belt is more preferable.

The drying temperature (the temperature of the hot air) in the hot air drying is preferably 120 to 250 ° C., more preferably 150 to 200 ° C. from the viewpoint of the color tone of the water-absorbent resin and the drying efficiency. The drying conditions other than the above-mentioned drying temperature, such as the wind speed and drying time of hot air, may be appropriately set according to the moisture content and the total weight of the particulate water-containing gel to be dried and the target resin solid content. When band drying is performed, the conditions described in WO2006 / 100300, WO2011 / 025012, 2011/025013 and 2011/111657 etc. are applied as appropriate.
By setting the above-mentioned drying temperature and drying time in the above ranges, the CRC (water absorption magnification), Ext (water-soluble component), and color tone of the obtained water absorbent resin can be set in desired ranges.

(6) Pulverization, classification step In this step, the dried polymer obtained in the above-mentioned drying step is pulverized (pulverization step), adjusted to a particle size of a predetermined range (classification step), water absorbent resin powder (surface cross-linking In this step, a powdered water-absorbent resin before application is conveniently referred to as "water-absorbent resin powder".

  Examples of the equipment used in the pulverization process of the present invention include a high-speed rotary pulverizer such as a roll mill, a hammer mill, a screw mill, and a pin mill, a vibration mill, a knuckle type pulverizer, and a cylindrical mixer. Used together.

  Further, the particle size adjustment method in the classification step of the present invention is not particularly limited, and examples thereof include sieve classification and air flow classification using a JIS standard sieve (JIS Z8801-1 (2000)). The particle size adjustment of the water-absorbent resin is not limited to the above-mentioned crushing step and classification step, and the polymerization step (particularly reverse phase suspension polymerization or spray droplet polymerization) and other steps (for example, granulation step, fine powder recovery step) ).

(7) Surface cross-linking treatment (also simply referred to as surface cross-linking)
This step is a step of providing a portion with a higher crosslink density on the surface layer of the water absorbent resin powder (a portion of several tens of μm from the surface of the water absorbent resin powder) obtained through the above steps. It consists of a process and a cooling process (optional).

  In the surface crosslinking step, a water absorbent resin (water absorbent resin particles) crosslinked on the surface by radical crosslinking or surface polymerization on the surface of the water absorbent resin powder, a crosslinking reaction with a surface crosslinking agent, or the like is obtained.

  Although it does not specifically limit as a surface crosslinking agent used by this invention, An organic or inorganic surface crosslinking agent is mentioned. Among these, an organic surface cross-linking agent that reacts with a carboxyl group is preferable from the viewpoint of the physical properties of the water-absorbing resin and the handleability of the surface cross-linking agent. Examples thereof include one or more surface cross-linking agents disclosed in US Pat. No. 7,183,456. More specifically, polyhydric alcohol compounds, epoxy compounds, haloepoxy compounds, polyvalent amine compounds or their condensates with haloepoxy compounds, oxazoline compounds, oxazolidinone compounds, polyvalent metal salts, alkylene carbonate compounds, cyclic urea compounds, etc. Can be mentioned.

  The surface crosslinking agent is used in an amount of 0.01 to 10 parts by weight, more preferably 0.01 to 5 parts by weight, based on 100 parts by weight of the water absorbent resin powder. It is. The surface crosslinking agent is preferably added as an aqueous solution. In this case, the amount of water used is preferably 0.1 to 20 parts by weight, more preferably 0. 0 to 100 parts by weight of the water-absorbent resin powder. 5 to 10 parts by weight. Furthermore, if necessary, when using a hydrophilic organic solvent, the amount used is preferably 10 parts by weight or less, more preferably 5 parts by weight or less, with respect to 100 parts by weight of the water-absorbent resin powder.

  When the water absorbent resin is obtained by reverse phase suspension polymerization, for example, the water content of the water absorbent resin is preferably 5 to 50 weight during azeotropic dehydration and / or at the end of azeotropic dehydration after polymerization completion. By dispersing the surface cross-linking agent in a hydrophobic organic solvent at a percentage of 5%, preferably 5 to 40% by weight, more preferably 5 to 30% by weight, it is possible to obtain a water absorbent resin whose surface is cross-linked. .

  The water absorbent resin after mixing the surface crosslinking agent is preferably heat treated. As the conditions for carrying out the above heat treatment, the temperature of the water absorbent resin or the temperature of the heat medium is usually 60 to 280 ° C., preferably 100 to 250 ° C., more preferably 150 to 240 ° C. Minutes to 2 hours.

(8) Granulation step The water-absorbent resin (water-absorbent resin obtained by cross-linking the surface as described above) used for the waste liquid solidifying agent of the present invention is a rapid and uniform waste liquid solidification or a small amount. In order to achieve the effect of solidification of the waste solution, it is preferable to be adjusted to a specific particle size described later (described in the particle size of the waste solution solidifying agent described later).

  Furthermore, the particle diameter of the water-absorbent resin or the waste liquid solidifying agent may be adjusted by further adding and mixing insoluble fine particles and a hydrophilic solvent, preferably water, and further granulating according to the purpose and its necessity. By granulating, the solidification time can be shortened, and further, the floating described later can be adjusted. When the granulation is performed together with the surface cross-linking described above, the granulation may be performed simultaneously with the surface cross-linking or may be performed separately. Water or polyhydric alcohol is preferably used as a binder in granulation.

  As a method for producing an irregularly shaped granulated material, for example, the method described in (1) JP-A-11-106514, that is, an aqueous liquid previously heated to a water-absorbent resin fine powder (150 μm or less) is subjected to high speed in a short time. After mixing, drying and crushing are carried out to obtain an irregularly shaped granulated material, (2) a method of crosslinking the vicinity of the surface of the irregularly shaped granulated material obtained in the above (1), etc. It is done. Furthermore, (3) after mixing the water-absorbing resin cross-linked in the vicinity of the surface and an aqueous liquid at room temperature, a method of adjusting the particle size by drying and pulverizing as necessary may be mentioned.

Furthermore, when reverse phase suspension polymerization is performed, the water-containing polymer gel dispersed during or after polymerization may be coagulated and granulated. Addition of inorganic fine particles (for example, hydrophilic silica fine particles) (US Pat. No. 4,732,968) and two-stage polymerization (European Patent No. 807646) are used for granulation by reverse phase aggregation.

  The presence or absence of granulation can be easily confirmed by an increase in particle size and a decrease in the amount of fine particles before and after that and a microphotograph of a product (water absorbent resin or waste liquid solidifying agent).

(II) Hydrophobic Substance Next, the hydrophobic substance in the present invention will be described. The hydrophobic substance used in the waste liquid solidifying agent used in the present invention is a water-insoluble or poorly water-soluble substance, and is a non-volatile hydrophobic substance which is stably non-water-absorbent (non-water-swellable). Non-water absorbency (non-water swellability) means that the water absorption capacity (CRC) described later is 1 g / g or less, preferably 0.5 g / g or less.

(Methanol index)
In the present invention, the methanol index is also used as a hydrophobicity index. When 1 g of a hydrophobic substance is added to 50 ml of pure water at 25 ° C., the methanol index is the 25 ° C. methanol volume (ml) necessary for wetting the hydrophobic substance if it is solid, or When the hydrophobic substance is a liquid, it refers to the 25 ° C. methanol volume (ml) necessary to disperse and / or emulsify the same.

  The hydrophobic substance is a substance containing a hydrophobic group in the molecule, and as the hydrophobic group, a chain hydrocarbon or an aromatic hydrocarbon is mainly used, and the hydrophobicity increases as the hydrocarbon chain becomes longer. . Besides these, halogenated alkyl groups (RX-), organosilicon groups (e.g. RSi (CH3) 2-), fluorocarbon groups (e.g. CnF2n + 1) and the like also belong to this group.

  When the hydrophobic substance is a powder, the particle size of the hydrophobic substance is not particularly limited, but usually, it is smaller than the weight average particle size of the water absorbent resin, and 90 to 100% by weight of the powder is 200 μm or less It is preferably 100 μm or less, more preferably 50 μm or less, particularly preferably 10 μm or less. In addition, about the addition method and addition amount of this hydrophobic substance, it mentions later in the term of "the manufacturing method of a (III) waste liquid solidification agent". The lower limit of the particle size is usually about 0.001 μm. These hydrophobic substances need to remain or be immobilized on the water-absorbent resin, so that substances which are solid to nonvolatile at room temperature (25 ° C.) and normal pressure are used. Here, non-volatility means a substance having a boiling point of 150 ° C. or more, preferably 200 ° C. or more, more preferably 250 ° C. or more, more preferably 300 ° C. or more, and a solid is preferably used. The melting point is 25 ° C. or more, preferably 50 ° C. or more, more preferably 75 ° C. or more, and still more preferably 100 ° C. or more. In the case of using a volatile substance, it becomes difficult to immobilize on a water-absorbent resin, and there may also be a problem of odor.

  Examples of the hydrophobic substance include hydrocarbons, fatty acids, fatty acid esters, fatty acid amides, metal soaps, silicone compounds, surfactants, thermoplastic resins and the like.

(hydrocarbon)
As the hydrocarbon, a methanol index is preferably 100 or more, more preferably 150 or more, and still more preferably 150 or more. For example, low molecular weight polyethylene (for example, molecular weight about 1,500 to 2,000) can be used. In addition, the methanol index | exponent of Sumitomo Seika Co., Ltd. fine powder polyethylene (Flow sen F-1.5) is 200 or more.

(Fatty acid, fatty acid amide, fatty acid ester)
Fatty acids, fatty acid amides, fatty acid esters have an ester structure derived from a carboxyl group or a carboxy group, and an amide structure, and particularly when mixed with a water absorbent resin made of acrylic acid (salt) as a raw material, the affinity with the water absorbent resin is high. It is preferably used as a hydrophobization treatment agent because it is less likely to come off from the surface of the water absorbent resin. Among these, a methanol index of 100 or more is preferable, 150 or more is more preferable, and 150 or more is more preferably used, but a fatty acid amide comprising a fatty acid having 12 or more carbon atoms and a fatty acid having 12 or more carbon atoms A fatty acid ester is preferred. Specific examples of the fatty acid include lauric acid, myristic acid, palmitic acid, oleic acid, stearic acid, arachidic acid, behenic acid and the like. The methanol index of stearic acid (manufactured by Wako Pure Chemical Industries, Ltd.) is 100. However, in the measurement of the methanol index, a powder that was ground with a mortar as stearic acid and then passed through a JIS 200 μm sieve was used. Specific examples of fatty acid amides include stearylamide, palmymilamide, oleylamide, methylenebisstearoamide, ethylenebisstearoamide, erucic acid amide and the like. The methanol index of erucic acid amide (manufactured by Tokyo Chemical Industry Co., Ltd.) is 150. However, in the measurement of the methanol index, powder that passed through a JIS 200 μm sieve after being ground with mortar as erucic acid amide was used.

  Specific examples of fatty acid esters include stearyl stearate, methyl stearate, hydrogenated castor oil, and ethylene glycol monostearate. In addition, the methanol index of stearyl stearate (trade name Unistar M-9676, manufactured by Nippon Oil & Fats Co., Ltd.) is 150. However, in the case of measurement of the methanol index, powder was used which was passed through a JIS 200 μm sieve after being ground in a mortar as stearyl stearate.

(Metal soap)
The metal soap consists of metal salts other than alkali metal salts such as fatty acids which are organic acids, petroleum acids, and polymeric acids. Examples of organic acids that constitute metal soaps include long chain or branched fatty acids such as caproic acid, octylic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, oleic acid and stearic acid, benzoic acid, myristic acid, naphthenic acid Acids, petroleum acids such as naphthoic acid and naphthoxyacetic acid, and polymer acids such as poly (meth) acrylic acid and polysulfonic acid can be exemplified, but it is an organic acid having a carboxyl group in the molecule that acrylic acid (salt) It is preferable as a hydrophobization treatment agent because it has high affinity to the water-absorbent resin when mixed with the water-absorbent resin as a raw material, and it is difficult to cause detachment from the surface of the water-absorbent resin, and more preferably caproic acid, octylic acid It is a fatty acid such as decanoic acid, lauric acid, myristic acid, palmitic acid, oleic acid, stearic acid, bovine fatty acid or castor-cured fatty acid. More preferably, it is a fatty acid having no unsaturated bond in the molecule, such as caproic acid, octylic acid, decanoic acid, lauric acid, myristic acid, palmitic acid and stearic acid. Most preferably, it is a long chain fatty acid having 12 or more carbon atoms in the molecule and having no unsaturated bond in the molecule, such as lauric acid, myristic acid, palmitic acid, and stearic acid.

  Even when a fatty acid having an unsaturated bond in the molecule is used, it is possible to achieve the object of the present invention, but when the waste solution solidifying agent using these is subjected to heat or oxidation during storage, coloring or May cause odor. As the organic acid, it is preferable to use one containing 7 or more carbon atoms in the molecule. The use of an organic acid having less than 7 carbon atoms in the molecule is not preferable because the solubility of the hydrophobic substance in water is increased and the hydrophobic substance may be eluted in medical waste liquid containing blood or body fluid. In addition, when an organic acid such as oxalic acid or citric acid having a carbon number of less than 7 is used in the molecule, the hardness of these metal salts is high. May cause a decrease in liquid absorption characteristics.

  The metal salt which comprises the said metal soap will not be specifically limited if it is metal salts other than alkali metal salts, such as alkaline-earth metal salt and transition metal salt, A magnesium salt, a calcium salt, a strontium salt, a barium salt , Zinc salts, cadmium salts, aluminum salts, tin salts, and lead salts. Among these, barium salts, calcium salts, magnesium salts, aluminum salts, and zinc salts are preferable because of their availability, and calcium salts and zinc salts are most preferable. Moreover, it does not specifically limit about the combination of the said organic acid and said metal salt which comprise metal soap, Moreover, you may use them individually and / or 2 or more types together.

  When a polymeric acid such as polyacrylic acid is used as the organic acid, for example, 95 mol% or more of the carboxyl group of the polymeric acid preferably forms a salt with the polyvalent metal, and more preferably Preferably it is 98 mol% or more, More preferably, it is 99 mol% or more. The molecular weight of the polymer acid used is usually 35,000 or more, preferably 50,000 or more in terms of weight average molecular weight. In addition, the methanol index of aluminum tristearate (Kanto Chemical Co., Ltd. deer grade 1) is 150, and the methanol index of zinc stearate (Kanto Chemical Co., Ltd. deer grade 1) is 200 or more.

(Silicon compounds)
Examples of silicon-based compounds include hydrophobic silicon dioxide compounds in which a silicon compound (hexamethylene silazane, monomethyl trichlorosilazane, dimethyldichlorosilane, silicon oil, etc.) is added to a silanol group (Si-OH) of hydrophilic silicon dioxide. However, it is not particularly limited.

(Surfactant)
The surfactant is a substance having a hydrophilic group and a lipophilic group at the same time. Examples of hydrophilic atomic groups include ionic ones such as -COO- and -OSO3- and nonionic ones such as polyoxyethylene chains. Examples of lipophilic atomic groups include linear or cyclic compounds such as alkyl groups and alkylallyl groups. Further, as a hydrophobic and oleophobic atomic group, there is a fluorine-containing compound such as a perfluoroalkyl group. In terms of the structure of the surfactant, there are an ionic surfactant that dissociates into ions and a non-ionic surfactant that does not dissociate into ions, and the ionic surfactant is charged when it dissociates in the state of an aqueous solution It can be classified into anionic surfactants, cationic surfactants and amphoteric surfactants according to the type of the organic solvent, but it is not particularly limited. In addition, as a fluorochemical surfactant, the brand name DS-403 perfluoroalkyl ethylene oxide adduct as a nonionic thing; Daikin Industries, Ltd. make, a brand name Ftergent 300 as a cationic thing; Neos Co. can give.

(III) Hydrophilic Substance In the present invention, it is more preferable to use a hydrophilic substance together with the hydrophobic substance. The hydrophobic substance described in (II) hydrophobic substance in the present invention is to hydrophobize a water-absorbent resin (true density is about 1.6 g / cm ³ or so) which has a density larger than water or aqueous waste and is inherently precipitated. It has the effect of suspending it in the waste solution, but it also has the undesirable effect of absorbing the waste solution and reducing the rate of gelation (solidification) due to its hydrophobization. The effects of the present invention can be enhanced by attaching both hydrophilic substances and hydrophobic substances near the surface. In this attachment step, the hydrophilic substance and the hydrophobic substance may be attached in separate steps or in the same step. Since there is an optimum deposition condition for each, it is preferable to deposit each in a separate step.

  Specific examples of hydrophilic substances include metal oxides such as silicon dioxide and titanium oxide, silicic acid (salts) such as natural zeolite and synthetic zeolite, inorganic compounds such as kaolin, talc, clay and bentonite, and other organic compounds. Etc. Of these, silicon dioxide is more preferable, and for example, fine-particle silica such as Aerosil 200 manufactured by Nippon Aerosil Co., Ltd. is more preferable. The content thereof needs to be adjusted to exhibit the behavior in the waste liquid required for the solidifying agent of the present invention, and preferably 0.1 parts by weight with respect to 100 parts by weight of the water absorbing resin and / or the waste liquid solidifying agent. Parts by weight or more, more preferably 0.3 parts by weight or more, still more preferably 0.5 parts by weight or more, and the upper limit is preferably 5 parts by weight or less, more preferably 3 parts by weight or less, still more preferably 1 part by weight or less. It is.

  The method of mixing the water absorbing resin and / or the waste liquid solidifying agent and the hydrophilic substance, preferably the inorganic powder, is not particularly limited, and for example, a dry blending method of mixing powders, a wet mixing method, etc. can be adopted. And dry blending are more preferable.

(IV) Method for Producing Waste Solidifying Agent The method for producing a waste solidifying agent according to the present invention comprises mixing a water-absorbent resin particle having a crosslinked structure obtained by polymerizing a water-soluble ethylenically unsaturated monomer with a hydrophobic substance. Preferably, the method further comprises the step of mixing the hydrophilic substance, or the step of simultaneously mixing the hydrophilic substance and the hydrophobic substance.

  In the method for producing a waste liquid solidifying agent according to the present invention, the step of mixing the hydrophobic substance, or the step of mixing the hydrophilic substance, or the step of mixing the hydrophobic substance and the hydrophilic substance is a hydrophobic substance or a hydrophilic substance. The manufacturing method is not particularly limited as long as the substance, or both of a hydrophobic substance and a hydrophilic substance can substantially immobilize the water-absorbent resin, but the method is not particularly limited. Any one of the methods is mentioned.

  1. Hydrophobic substance, hydrophilic substance, or both hydrophobic substance and hydrophilic substance are dispersed in a monomer solution containing an internal crosslinking agent at the time of polymerization of the water-absorbent resin, polymerized, dried and pulverized if necessary. A method for producing a particulate waste liquid solidifying agent by subjecting the surface of the water-absorbent resin to surface crosslinking treatment.

  2. After polymerizing a monomer solution containing an internal crosslinking agent at the time of polymerization of the water-absorbent resin and drying and pulverizing it if necessary, a water-absorbent resin is obtained, and then a hydrophobic substance or a hydrophilic substance or a hydrophobic substance and a hydrophilic substance A method for producing a particulate waste liquid solidifying agent by adding and mixing any of the above and further subjecting the surface to a surface cross-linking treatment.

  3. After polymerizing a monomer solution containing an internal crosslinking agent at the time of polymerization of the water absorbent resin and drying and pulverizing it if necessary to obtain a water absorbent resin, the surface crosslinking agent is hydrophobic when it is subjected to surface crosslinking treatment A method for producing a waste liquid solidifying agent by dispersing a hydrophilic substance, a hydrophilic substance, or a hydrophobic substance and a hydrophilic substance.

  4. At the time of polymerization of the water absorbent resin, a monomer solution containing an internal crosslinking agent is polymerized, and if necessary, the surface crosslinking treatment is carried out in the vicinity of the surface of the water absorbent resin obtained by drying and pulverizing to obtain the water absorbent resin, A method for producing a waste liquid solidifying agent by adding and mixing a hydrophobic substance, a hydrophilic substance, or both a hydrophobic substance and a hydrophilic substance.

  5. After polymerizing a monomer solution containing an internal crosslinking agent at the time of polymerization of the water-absorbent resin and optionally drying and pulverizing it, surface crosslinking treatment is carried out near the surface of the water-absorbent resin to obtain a water-absorbent resin A method of producing a waste liquid solidifying agent by adding and mixing a hydrophobic substance, a hydrophilic substance, or both a hydrophobic substance and a hydrophilic substance in a cooling step.

  In the methods 1 to 5 above, at the time of polymerization of the water-absorbent resin in 1), a hydrophobic substance or a hydrophilic substance or any one of a hydrophobic substance and a hydrophilic substance may be added to the monomer. In order to realize a state in which the hydrophobic substance is uniformly attached to the surface of the conductive resin, the above methods 2 to 5 are preferable.

  The hydrophobic substance and the hydrophilic substance used in the present invention are as described above, and when the solidifying agent is added to the waste liquid by being substantially fixed, preferably adhering to the surface of the water absorbent resin, A part is settled in the waste liquid, a part is floated on the upper surface, at least a part of the floating solidifying agent is swollen while settling, and at least a part of the floating waste solidifying agent is swollen while floating. .

In other words, the true density of the water-absorbent resin depends on the monomer, but in the case of a polymer from sodium acrylate, it is about 1.6 g / cm ³ , and 2.5% by weight of chloride from the true density. It does not float in an aqueous sodium solution (density: about 1.0 g / cm ³ ), but by using a hydrophobic substance, it solidifies mainly of a water absorbent resin or a water absorbent resin with a true density of 1.6 g / cm 3 The agent becomes at least partially suspended in a 2.5% by weight aqueous sodium chloride solution (density ̃1.0 g / cm ³ ).

  If it is simply suspended in the waste liquid, it can be achieved by increasing the hydrophobicity, but if the hydrophobicity is too strong, the waste liquid is absorbed only by the solidifying agent in contact with the waste liquid, and only the solidifying agent in the wetted part is present. Swells a lot. From this fact, only the solidifying agent in the wetted part rapidly increases in apparent density and the hydrophilicity also rapidly increases, so that part of the solidifying agent in the wetted part can not maintain the floating state and is peeled off from the floating solidifying agent layer Falls and sinks. By repeating this, if the hydrophobicity is too strong, coexistence of swelling and floating of the solidifying agent does not occur, and the gelation of the waste liquid is performed by solidification (gelation) from the bottom by the settled solidifying agent, and the solidification time Becomes long or solidification does not occur.

  In order to cause the solidifying agent layer to swell while floating, not only the wetted part in the floating solidifying agent layer but also the waste liquid penetrates to some extent into the solidifying agent layer and the whole solidifying agent layer gradually swells. By preventing sudden increase in apparent density and rapid decrease in hydrophobicity (rapid increase in hydrophilicity) of the solidifying agent layer, the solidifying agent layer is prevented from falling off and swollen while the solidifying agent layer is floating. It is preferable to (gel).

  In general, if the same substance is used, the larger the particle diameter, the easier it is to settle, and it is necessary to increase the hydrophobicity in order to float the solidifying agent having a large particle diameter. However, if the hydrophobicity is too strong, swelling (gelation) occurs only in the wetted part due to the above-mentioned reason and only the wetted part is precipitated, so that the suspended state can not be maintained. That is, when the particle size is too large, it is difficult to balance the solidifying agent floating and swelling while floating. On the other hand, if the particle size is reduced, the ease of sedimentation is reduced, and therefore the degree of hydrophobicity for floating can be reduced, and the relatively weak hydrophobicity to the extent that waste liquid penetrates into the solidified solidifying agent layer. Can give rise to flotation of the solidifying agent. In addition, these behaviors also change depending on the water absorption capacity of the water-absorbent resin, and in a region where the water absorption capacity is relatively high, use a specific amount of a hydrophilic substance to uniformly, in an extremely short time, or relatively less It was found that it can be solidified in quantity.

  From these findings, it is a feature of the present invention that at least a part of the solidifying agent is precipitated, a part is suspended, and at least a part of the suspended solidifying agent is precipitated and swollen and at least a part of the solidified waste agent solidified. In the water-absorbent resin contained in the solidifying agent that swells while partly floating, there is a suitable range of physical properties that can balance sedimentation and floating.

  Specifically, the lower limit of the weight average particle diameter (D50) of the water absorbing resin is preferably 150 μm or more, more preferably 200 μm or more, and the upper limit is preferably 350 μm or less, more preferably 300 μm or less It is a preferable form that is contained in the solidifying agent. The water absorption capacity of the water-absorbent resin contained in the solidifying agent is preferably 30 g / g or more, more preferably 34 g / g or more, still more preferably 40 g / g or more, particularly preferably 45 g / g or more It is. If the water absorption ratio is too low, the amount of the solidifying agent required increases and the solidification time becomes long. The water-absorbing resin contained in the solidifying agent contains a hydrophilic substance in an amount of 0.1 parts by weight or more, more preferably 0.3 parts by weight or more, still more preferably 0.5 parts by weight or more with respect to the water-absorbing resin. The upper limit is preferably 5 parts by weight or less, more preferably 3 parts by weight or less, and still more preferably 1 part by weight or less.

As for the particle size distribution is preferably the proportion of the water-absorbent resin in a 350μm below the range of 150μm to the whole water-absorbent resin is 20 wt% or more, more preferably 25 wt% or more, more preferably 30 wt% Or more, and most preferably 35% by weight or more.

  In addition to the hydrophobic substance, the combined use of a hydrophilic substance is a preferable form in order to cause the waste liquid to permeate into the suspended solidifying agent layer while maintaining the hydrophobicity to cause swelling. This is because both the hydrophobic part and the hydrophilic part are provided on the surface of the water-absorbent resin contained in the solidifying agent, so that the hydrophobic part contributes to the floating of the solidifying agent and the hydrophilic part becomes a wastewater passage, improving the swelling rate, The present invention in which the suspended solidifying agent layer is swollen as a whole (gelation) to prevent a sudden increase in the apparent density of only the wetted part of the suspended solidifying agent layer, and the solidifying agent layer swells while remaining floating. It is considered that this form is more preferably achieved.

(Mixing method)
When the hydrophobic substance used in the present invention is a powder, a method of directly mixing the hydrophobic substance as it is with the water-absorbent resin as it is, for example, a dry blending method, or the above surface crosslinking agent and water, and Accordingly, the hydrophobic substance is dispersed in the form of a slurry in a surface crosslinking agent solution in which a hydrophilic organic solvent is mixed and then mixed with the water absorbent resin, or the hydrophobic substance is slurried in water or a hydrophilic organic solvent A method of dispersing in a water absorbent resin and mixing with a water absorbent resin is used.

  When the hydrophobic substance is dispersed in the form of a slurry and mixed with the water absorbent resin, the amount of water used as necessary or the amount of aqueous liquid comprising water and a hydrophilic organic solvent depends on the type and particle size of the water absorbent resin. Although the optimum amount is different, in the case of water, it is usually in the range of 10 parts by weight or less, preferably 1 to 5 parts by weight with respect to 100 parts by weight of the solid content of the water absorbent resin. Similarly, the amount of the hydrophilic organic solvent to be used is usually 10 parts by weight or less, preferably in the range of 0.1 to 5 parts by weight with respect to 100 parts by weight of the solid content of the water absorbent resin. Further, the concentration of the hydrophobic substance in the slurry is appropriately selected depending on the type of the hydrophobic substance to be used and the dispersion solvent, and the viscosity of the slurry, and is not particularly limited, but usually 0.001 to 30% by weight Preferably it is 0.01 to 10 weight% of range.

  The powder temperature of the water-absorbing resin when mixed with the hydrophobic substance is usually mixed at room temperature or higher, but in order to obtain stable liquid absorption characteristics of the particulate waste solution solidifying agent and fluidity at the time of moisture absorption, it is preferable. Is mixed at 40 to 180 ° C., more preferably 50 to 100 ° C.

  In the method for producing a waste liquid solidifying agent of the present invention, the amount of the hydrophobic substance added varies depending on the blood concentration in the waste liquid, etc., but the content of the hydrophobic substance is preferably 0. The content is at least 05 wt% (500 ppm), more preferably at least 0.06 wt% (600 ppm), and the upper limit thereof is preferably 5.0 wt% (50000 ppm) or less, more preferably 3 wt% (30000 ppm) or less More preferably, it is 1 weight% (10000 ppm) or less. If the amount of the hydrophobic substance added is less than 0.05% by weight (500 ppm), the floating of the waste solution solidifying agent into the waste liquid is insufficient, and as a result, the settling of the waste liquid solidifying agent becomes faster. Since the solidification from the water mainly occurs, the time until the whole waste liquid is solidified becomes long or solidification does not occur. On the other hand, when the added amount of the hydrophobic substance exceeds 50000 ppm, when the waste liquid solidifying agent is added to the waste liquid, the floating solidifying agent does not swell while floating, or the solidifying agent is only from the liquid contact part with the waste liquid. Since it swells and there is almost no solidification from the bottom, solidification from the top, that is, the floating solidifying agent swells while floating and the gel layer does not sufficiently grow from the top to the bottom, so the entire waste liquid is It takes a long time to solidify or no solidification occurs.

  The apparatus used when mixing the water-absorbent resin and the liquid, powder and / or slurry solution containing a hydrophobic substance in the present invention may be a usual apparatus, for example, a cylindrical mixer, screw mixer Screw extruder, turbulizer, nauta mixer, V mixer, ribbon mixer, double arm kneader, fluid mixer, air mixer, rotary disk mixer, roll mixer, roll mixer Examples thereof include a dynamic mixer, and the speed during mixing may be high or low. These mixers can also be used for mixing the surface cross-linking agent in the surface cross-linking of the water-absorbent resin.

(Other substances)
In the method for producing the waste liquid solidifying agent according to the present invention, the deodorant, the antibacterial agent, the fragrance, the foaming agent, the pigment, the dye, and the plasticizer are further provided within the range not impairing the effects of the present invention. Adhesives, surfactants, fertilizers, oxidizing agents, protein crosslinking agents, reducing agents, water, salts, chelating agents, bactericidal agents, hydrophilic polymers such as polyethylene glycol and polyethylene imine, and heat such as polyester resin and urea resin It may include a step of imparting various functions such as adding a curable resin. The amount of the hydrophobic or hydrophilic substance used is usually 0 to 30 parts by weight, preferably 0 to 10 parts by weight, more preferably 0 to 1 parts by weight, per 100 parts by weight of the water absorbent resin.

  According to each of the above configurations, the solidification time of the medical waste liquid containing blood, body fluid, and the like can be significantly shortened. In particular, in a vertically long waste liquid container, the solidification time of the medical waste liquid containing blood or body fluid can be remarkably shortened.

(IV) Waste Liquid Solidifying Agent The waste liquid solidifying agent of the present invention obtained as an example of the above-mentioned production method is a particulate solid treatment used in the method of treating waste liquid which solidifies the waste liquid into gel by putting treatment agent into waste liquid. Agent, which is essentially a water-absorbent resin having a crosslinked structure obtained by polymerizing a water-soluble ethylenic unsaturated monomer, and when it is collectively introduced into a 2.5% by weight aqueous solution of sodium chloride, It is a waste liquid solidifying agent characterized in that it sediments, a part floats, and at least a part of the floated solidifying agent swells while settling and at least a part of the floated solidifying agent swells while floating.

  A preferred embodiment of the waste solution solidifying agent according to the present invention is a particulate waste solution solidifying agent essentially comprising a water-absorbent resin having a cross-linked structure obtained by polymerizing a water-soluble ethylenically unsaturated monomer, It is a waste solution solidifying agent which further contains a hydrophobic substance and a hydrophilic substance in addition to the sexing resin.

  In these waste liquid solidifying agents, the content of the hydrophobic substance with respect to the water absorbent resin is preferably 0.05% by weight (500 ppm) or more, more preferably 0.06% by weight (600 ppm) or more, and the upper limit is preferably The content is 5% by weight (50000 ppm) or less, more preferably 3% by weight (30000 ppm) or less, still more preferably 1% by weight (10000 ppm) or less, and preferably, the hydrophobic substance is present on the surface of the water absorbent resin.

(1) Water-absorbent resin content The water-absorbent resin content is usually 50 to 100% by weight, preferably 70 to 99% by weight, and more preferably 80 to 98% by weight in the waste solution solidifying agent. Preferably, the above-mentioned hydrophobic substance, hydrophilic substance and water are used as minor components other than the above.

(2) Solidification time The waste liquid solidifying agent of the present invention contains the hydrophobic substance used in the present invention, the hydrophilic substance, and the water-absorbent resin used in the present invention, and is 2.5% by weight chloride at 25 ° C. From the time when 120 g of the waste solution solidifying agent filled in a container with an effective volume of 3500 ml placed vertically as an axial direction containing 3500 ml of sodium aqueous solution as a batch, the entire 2.5% sodium chloride aqueous solution is 2.5% sodium chloride It takes 35 minutes or less, preferably 30 minutes or less, more preferably 25 minutes or less, still more preferably 15 minutes or less, particularly preferably 10 minutes or less, to replace the waste solution solidifying agent that has absorbed the aqueous solution. Most preferably, it is 8 minutes or less.

  If the solidification time exceeds 35 minutes, the solidification time may be too long to cause inconvenience in actual use, and may not reach solidification, and if it is less than 1 minute, the solidification may become uneven. There is. In addition, the measuring method of solidification time is later mentioned in an Example.

(3) Water absorption ratio (CRC)
The water absorption capacity (CRC) of the waste solution solidifying agent according to the present invention is usually 30 g / g or more, preferably 34 g / g or more, more preferably 40 g / g or more, still more preferably 45 g / g or more with respect to physiological saline The The upper limit is not particularly limited, but about 100 g / g is usually sufficient. When the water absorption capacity is low, a large amount of solidifying agent is required, and the solidifying time is also long. The water absorption ratio may be appropriately adjusted to the internal crosslinking and surface crosslinking of the water absorbent resin. A method for measuring the water absorption magnification (CRC) will be described later in Examples.

(4) Particle diameter Although the particulate waste solution solidifying agent of the present invention is in the form of particles, the waste liquid solidifying agent preferably has a particle size of less than 850 μm and 90 to 100% by weight of the whole particles. It is 100% by weight, more preferably 98 to 100% by weight. The lower limit of the weight average particle size of the waste solution solidifying agent is preferably 150 μm, more preferably 200 μm, and the upper limit is preferably 350 μm, more preferably 300 μm. When the average particle size exceeds 350 μm, it becomes difficult to control the solidifying agent to swell while maintaining the floating state, and when it is less than 150 μm, the working environment of waste liquid solidification becomes worse due to powdering and the like. The control of the particle diameter may be appropriately adjusted by granulation, pulverization or classification, and polymerization control in the reverse phase. In addition, the particle diameter may be adjusted at the stage of the water-absorbent resin, and thus is also a particle diameter of a preferable water-absorbent resin. The water absorbing resin and the waste liquid solidifying agent are granulated to shorten the solidifying time and adjust the floating.

  When the particles smaller than 106 μm exceed 10% by weight, the diffusibility of blood, urine, etc. is impeded at the time of fluid absorption, and the contact area with air increases at the time of use, so the waste solution solidifying agent becomes easy to solubilize When the waste liquid solidifying agent is added to the waste liquid, so-called mamako may be formed on the liquid level of the waste liquid, which is not preferable. When the particle size exceeding 850 μm exceeds 10% by weight, the liquid absorption rate of the waste liquid solidifying agent is decreased, which is not preferable.

(5) Shape As the shape, for example, the spherical and / or ellipsoidal or wiener sausage-like primary particle shape obtained by reverse phase suspension polymerization described in FIGS. 1 and 2 of US Pat. No. 5,244,735, NONWOVENS WOLDOOctober-November 2000 (Marketing Technology Service, Inc.), page 75, Agglomerated beads as described in FIG. 1 in the form of agglomerated spheres and / or the shape of primary particle granules in which ellipsoidal particles are agglomerated, US Water-containing gel-like polymerization obtained by polymerizing an aqueous monomer solution, such as the crystals (Crystals) shown in FIG. 2, 3 and 4 of Japanese Patent No. 5981070 and FIG. 1 on page 75 of NONWOVENS WOLDOctober-November 2000. Include the shape of the irregular shape and granule has a shape derived from crushed.

  The shape of the waste liquid solidifying agent according to the present invention can be obtained by polymerizing spherical primary particles, elliptical spherical (elliptical) primary particles, spherical particles or granules of ellipsoidal particles, and monomer particles. The shape may be any of an irregular shape derived from a crushed product of a water-containing gel-like polymer, or a shape of a granulated product thereof, but granulation is preferably carried out simultaneously with or separately from surface crosslinking for shortening solidification time and adjustment of suspension. Is done.

(6) Absorption capacity under pressure (AAP)
It is also preferable that the waste solution solidifying agent of the present invention has an absorption capacity under pressure of a fixed value or more from the viewpoint of solidification efficiency. The absorption capacity under load at a load of 2.06 kPa and / or 4.83 kPa (under load) is 3 g / g or more, preferably 5 g / g or more, more preferably 10 g / g or more, and still more preferably 20 g / g. g or more, most preferably 25 g / g or more. What is necessary is just to adjust the absorption capacity | capacitance under pressure suitably, for example by adjusting the said surface bridge | crosslinking.

  In addition, it is preferable that the waste liquid solidifying agent of the present invention hardly decreases the absorption capacity under pressure even when an impact force is applied. As a result, there is little performance degradation during actual use.

(7) Fluidity at the time of moisture absorption Fluidity at the time of moisture absorption (hereinafter simply referred to as hygroscopic flowability) is, for example, blocking or caking property under a high humidity environment such as 25 ° C. relative humidity 90% RH or powder The waste liquid solidifying agent according to the present invention is excellent in hygroscopic flowability without blocking or caking, when the water content of the waste liquid solidifying agent is usually in the range of about 10 to 30% by weight.
In addition, the waste liquid solidifying agent of the present invention exhibits good and stable powder flowability without lowering its fluidity at the time of moisture absorption even after being given an impact force.

(8) Powder characteristics The waste solution solidifying agent of the present invention has low adhesion not only at the time of moisture absorption but also at a water content of less than 10%, and the internal friction coefficient or internal friction angle is small, so the angle of repose becomes small. It shows the characteristics of excellent fluidity of powder. The internal friction coefficient and the internal friction angle in the powder characteristics can be determined from a shear test of the powder layer. As a device for conducting a shear test of powder, there is a shear box type, a ring shear type, or a parallel plate type, and there is, for example, Jenike Shear Cell. Since the waste liquid solidifying agent of the present invention has the above-mentioned powder characteristics, it is useful for simplifying a hopper, a powder storage tank, and the like used in the manufacturing process of the waste liquid solidifying agent.

(9) Bulk density and true density The bulk density of the waste liquid solidifying agent of the present invention is usually 0.30 to 2.5 g / cm ³ , preferably 0.50 to 0.80 g / cm ³ , more preferably 0.60 to It has a density of 0.80 g / cm ³ and a true density (as defined in European Patent 736,060) is usually in the range of 1.1 to 2.0 g / cm ³ and further 1.2 to 1.8 g / cm ³ . The waste solution solidifying agent of the present invention is characterized in that it floats in water (density 1.0) even if the true density exceeds 1.1 g / cm ³ . The bulk density and the true density are appropriately controlled by adjusting the monomer composition (bulk density and true density, particularly true density) and the particle diameter. If the bulk density and the true density are out of the above ranges, it may be difficult to control the solidification or floating or may cause a transportation problem.

(V) Waste liquid solidification method The waste liquid solidification method of the present invention is a treatment method of waste liquid in which the waste liquid is solidified in gel form by putting a treatment agent into waste liquid, and the waste liquid solidification of the present invention described above as the treatment agent An agent is used. The waste liquid solidifying agent of the present invention can be used to solidify various waste liquids such as beverage waste, factory waste, radiation waste, manure waste waste, etc. The waste liquid may contain organic substances or solid dispersions, etc. It is preferably used for the solidification of medical waste liquid which has many problems in the prior art. The waste liquid refers to an aqueous liquid for disposal or a filtered aqueous liquid. As the solidification method of the present invention, various container shapes (longitudinal, horizontal, etc.) and a method of charging the solidifying agent (batch charging / split charging into waste liquid, pre-loading / post charging into waste liquid), etc. can be widely applied. The waste solution solidifying agent of the present invention is preferably used for the solidification of waste solution in a longitudinal container, because of its rapid and uniform solidification. The powder may be charged as it is, or may be charged in a state in which the waste liquid solidifying agent is placed in a water-soluble, water-breakable to water-permeable container or bag.

  The particulate waste solidifying agent introduced into the waste liquid partially solidifies, partially floats, and swells while floating, solidification proceeds from above and below the waste liquid, so a container that is particularly long in the vertical direction is used. When used, the time until the entire waste liquid is solidified can be remarkably shortened.

(VI) Package for Waste Liquid Solidification The package for waste liquid solidification according to the present invention is characterized in that the waste liquid solidifying agent according to the present invention is packaged. The shape and material of the package of the present invention are not particularly limited. As the size of the package, it is preferable to be able to seal 10 to 3500 g of the waste solution solidifying agent, and to partially open the container, from which the waste solution solidifying agent can be taken out. Examples include water permeable packaging. Examples of the poly wide mouth bottle include a poly wide mouth bottle with soft packing (in the case of a commercially available product, for example, those described in the catalog 800 made by Terraoka Research Equipment; material polyethylene).

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to these Examples etc., unless the summary is exceeded. The physical properties described in these examples and comparative examples were measured by the following methods (1) to (2). Moreover, unless otherwise stated, "part" means a weight part (mass part).

(1) Particle Size The particle size (particle size distribution, weight average particle size (D50), logarithmic standard deviation of particle size distribution (σζ)) of the water absorbent resin or waste liquid solidifying agent of the present invention is determined by columns 27, 28 of US Pat. It measured based on "(3) Mass-Average Particle Diameter (D50) and Logarithmic Standard Deviation ((sigma) (perp)) of Particle Diameter Distribution" described in these.

(2) CRC (water absorption capacity without pressure, or simply called water absorption capacity)
The CRC (water absorption capacity without pressure, or simply referred to as water absorption capacity) of the water-absorbent resin of the present invention was measured according to the EDANA method (ERT 441.2-02).

(3) Solidification time (solidification test)
Polycarbonate with soft packing from the top of a container with an effective volume of 3500 ml, placed vertically as an axis, containing 3500 ml of a 2.5% by weight aqueous solution of sodium chloride at 25 ° C. (upper inner diameter 128 mm, lower inner diameter 102 mm, height 370 mm) In a wide-mouthed bottle (material polyethylene, described in Terraoka Research Equipment Catalog 800, content 200 cc) is charged 120 g of the waste liquid solidifying agent. The time from when the waste solidifying agent is charged to the time when the entire 2.5 wt% sodium chloride aqueous solution is replaced with the waste solidifying agent that has absorbed the 2.5 wt% sodium chloride aqueous solution is taken as the solidifying time. However, when gelation did not occur within 35 minutes, it was evaluated that gelation did not occur.
If the amount of solidifying agent used is reduced, record the amount used and the solidification time.

Production Example 1
4.5 g of polyethylene glycol diacrylate (average addition mole number of ethylene oxide 9) as an internal crosslinking agent is dissolved in 5500 g of a sodium acrylate aqueous solution having a neutralization ratio of 75 mol% (monomer concentration 38 wt%), After preparing the aqueous solution [a001], the solution was deaerated for 30 minutes in a nitrogen gas atmosphere.
Next, the above monomer aqueous solution [a 001] is charged into a reactor formed by attaching a lid to a double-arm type jacketed stainless steel kneader having two sigma-type blades with an internal volume of 10 L, and the solution temperature is 30 Nitrogen gas was blown into the reactor while maintaining the temperature in ° C., and nitrogen substitution was carried out so that the dissolved oxygen in the system became 1 ppm or less.
Subsequently, 29.8 g of a 10% by weight aqueous solution of sodium persulfate as a polymerization initiator and 6.0 g of a 0.2% by weight aqueous solution of L-ascorbic acid are separately separately stirred as the above-mentioned aqueous solution of monomer [a 001]. When added, polymerization started approximately 1 minute later.
Then, the formed hydrogel crosslinked polymer [b 001] is polymerized at 30 to 80 ° C. while being gel-grounded, and shows a polymerization peak temperature of 86 ° C. 17 minutes after the initiation of polymerization, and water is hydrated 60 minutes after the initiation of polymerization. A gel-like crosslinked polymer [b001] was taken out. The diameter of the obtained hydrogel-like crosslinked polymer [b001] was subdivided into about 1 to 5 mm.

The finely divided water-containing gel-like crosslinked polymer (1) was spread on a wire mesh of 300 μm (50 mesh) and hot-air dried at 180 ° C. for 45 minutes to obtain a dried product [b011].
Subsequently, the dried product [b011] was pulverized using a roll mill and further classified using JIS standard sieves having openings of 450 μm and 106 μm. The particles remaining on the sieve with an aperture of 450 μm are ground again with a roll mill, and the particles (fine powder) which have passed through the sieve with an aperture of 106 μm are mixed with 90 ° C. hot water and then dried as described above Processed under conditions and grinding conditions. The fine powder accounted for 13% by weight with respect to the total amount subjected to grinding. As a result of this series of operations, an irregularly crushed water absorbent resin powder [A010] was obtained. The CRC (water absorption capacity) of the water absorbent resin powder [A010] was 41.8 [g / g].

  Next, 3.33 parts by weight of an aqueous surface-crosslinking agent solution [c001] was mixed with 100 parts by weight of the water-absorbent resin powder [A010]. The aqueous surface crosslinking agent solution [c 001] is prepared by using 0.03 parts by weight of ethylene glycol diglycidyl ether, 0.2 parts by weight of 1,4-butanediol, 0.5 parts by weight of propylene glycol and 2.5 parts by weight of water. Become. The mixture was heat-treated in a mortar mixer heated to 195 ° C. for 40 minutes to obtain water-absorbing resin particles [A110] having a crosslinked surface. The water absorbent resin powder [A110] had a CRC (water absorption magnification) of 34.0 [g / g].

  A water absorbing resin [A111] was obtained by adding 0.5 parts by weight of fumed silica AEROSIL 200 manufactured by Nippon Aerosil Co., Ltd. to 100 parts by weight of water absorbing resin particles [A110] and uniformly mixing.

Production Example 2
The dried product [b012] obtained in the same manner as described in Production Example 1 was pulverized by a roll mill and further classified using JIS standard sieves having openings of 710 μm and 106 μm. The particles remaining on the sieve with an opening of 710 μm are ground again with a roll mill, and the particles (fine powder) which have passed through the sieve with an opening of 106 μm are mixed with 90 ° C. hot water and then dried as described above Processed under conditions and grinding conditions. The fine powder accounted for 10% by weight with respect to the total amount subjected to grinding. By these series of operations, a water-absorbing resin powder [A020] in the form of irregularly crushed particles was obtained. The CRC (centrifuge holding capacity) of the water-absorbent resin powder [A020] was 42.5 [g / g].

  Next, 2.93 parts by weight of a surface cross-linking agent aqueous solution [c002] was mixed with 100 parts by weight of the water absorbent resin powder [A020]. The aqueous surface crosslinking agent solution [c 002] contains 0.03 parts by weight of ethylene glycol diglycidyl ether, 0.2 parts by weight of 1,4-butanediol, 0.5 parts by weight of propylene glycol, and 2.1 parts by weight of water. Consists of. The above mixture was heat-treated in a mortar mixer heated to 195 ° C. for 40 minutes to obtain water-absorbing resin particles [A220]. The water absorbent resin powder [A220] had a CRC (water absorption magnification) of 34.8 [g / g].

  A water-absorbent resin [A221] was obtained by uniformly adding 0.3 parts by weight of fumed silica AEROSIL 200 manufactured by Nippon Aerosil Co., Ltd. to 100 parts by weight of the water-absorbent resin powder [A220].

Example 1
Add 0.08 parts by weight of zinc stearate to 100 parts by weight of a water-absorbent resin [A111] and stir at 100 rpm for 25 minutes using a three-one motor (type 600G manufactured by Haydon Co., Ltd.) at 25 ° C. and relative humidity 50% RH. Thus, a water absorbent resin [A112] was obtained. A solidification test was conducted on the water absorbent resin [A112] as the solidifying agent 1 of Example 1, and the results are shown in Table 1 below.

Example 2
The same operation was carried out except that 0.08 parts by weight of zinc stearate in Example 1 was replaced with 0.10 parts by weight, to obtain a water absorbent resin [A113]. The water-absorbent resin [A113] is shown as the solidifying agent 2 of Example 2 in Table 1 below.

[Example 3]
The same operation was carried out except that 0.08 parts by weight of zinc stearate in Example 1 was changed to 0.12 parts by weight, to obtain a water absorbent resin [A114]. The water absorbing resin [A114] is shown in Table 1 below as the solidifying agent 3 of Example 3.

Comparative Example 1
The same operation was performed except that 0.08 parts by weight of zinc stearate in Example 1 was changed to 0.04 parts by weight, to obtain a water absorbent resin [A115]. The water absorbing resin [A115] is shown in Table 1 below as the solidifying agent 4 of Comparative Example 1.

Comparative Example 2
Add 0.04 parts by weight of zinc stearate to 100 parts by weight of a water-absorbent resin [A221] and stir at 100 rpm for 25 minutes using a three-one motor (type 600G manufactured by Haydon Co., Ltd.) at 25 ° C and relative humidity 50% RH. Thus, a water absorbent resin [A222] was obtained. The water absorbent resin [A222] is shown in Table 1 below as the solidifying agent 5 of Comparative Example 2.

[Comparative Example 3]
A water absorbing resin [A116] was obtained by the same operation as in Example 1 except that 0.08 parts by weight of zinc stearate was replaced by 6.0 parts by weight. The water-absorbent resin [A116] is shown as the solidifying agent 6 of Comparative Example 3 in Table 1 below.

Example 4
In Production Example 1, the fumed silica AEROSIL200 added to the water absorbent resin particles [A110] was changed to 0.3 parts by weight to obtain a water absorbent resin [A117]. Furthermore, 0.6 parts by weight of zinc stearate was added to 100 parts by weight of a water-absorbent resin [A117] and stirred at 100 rpm for 25 minutes using a three one motor (type 600G manufactured by Haydon Co., Ltd.) at 25 ° C and relative humidity 50% RH. As a result, a water absorbent resin [A118] was obtained. The water-absorbent resin [A118] is shown as the solidifying agent 7 in Example 4 in Table 1 below.

[Example 5]
The same evaluation as in Example 4 was conducted except that the amount of the solidifying agent 7 used in the solidification test was 108 g (120 g to a 10% loss), and the results are shown in Table 1 below.

Comparative Example 4
The same operation was carried out except that 0.04 parts by weight of zinc stearate in Comparative Example 2 was changed to 0.16 parts by weight, to obtain a water absorbent resin [A223]. The water-absorbent resin [A223] was used as the solidifying agent 8 of Comparative Example 4, and the amount of the solidifying agent 8 used in the solidification test was evaluated at 108 g (120 g to a 10% weight loss).

[Production Example 3]
Dissolve 2.4 g of polyethylene glycol diacrylate (average addition mole number of ethylene oxide 9) as an internal crosslinking agent in 5500 g of a sodium acrylate aqueous solution (monomer concentration 38 wt%) having a neutralization ratio of 75 mol%, After preparing an aqueous solution [a003], the solution was deaerated for 30 minutes in a nitrogen gas atmosphere.
Next, the above monomer aqueous solution [a 003] is charged into a reactor formed by attaching a lid to a double-arm type jacketed stainless steel kneader having two sigma-type blades with an internal volume of 10 L, and the solution temperature is 30 Nitrogen gas was blown into the reactor while maintaining the temperature in ° C., and nitrogen substitution was carried out so that the dissolved oxygen in the system became 1 ppm or less.
Subsequently, 29.8 g of a 10% by weight aqueous solution of sodium persulfate as a polymerization initiator and 6.0 g of a 0.2% by weight aqueous solution of L-ascorbic acid are separately separately stirred as the above-mentioned aqueous solution of monomer [a 003]. When added, polymerization started approximately 1 minute later.
Then, the formed hydrogel crosslinked polymer [b 003] is polymerized at 30 to 80 ° C. while being gel-grounded, and shows a polymerization peak temperature of 88 ° C. 19 minutes after the initiation of the polymerization, and water retention 60 minutes after the initiation of the polymerization. A gel-like crosslinked polymer [b003] was taken out. The diameter of the obtained water-containing gel-like crosslinked polymer [b 003] was subdivided into about 1 to 5 mm.

  The finely divided water-containing gel-like crosslinked polymer [b 003] was spread on a wire mesh of 300 μm (50 mesh) and hot-air dried at 180 ° C. for 45 minutes to obtain a dried product [b 033].

  Subsequently, the dried product [b033] was pulverized using a roll mill, and further classified using JIS standard sieves having openings of 600 μm and 106 μm. The particles remaining on the sieve with an opening of 600 μm are ground again with a roll mill, and the particles (fine powder) which have passed through the sieve with an opening of 106 μm are mixed with 90 ° C. hot water and then dried as described above It processed on conditions and grinding conditions. The fines accounted for 14% by weight with respect to the total amount subjected to grinding. Through this series of operations, an irregularly crushed water-absorbent resin powder [A030] was obtained. The CRC of the water absorbent resin powder [A030] was 56.3 [g / g].

  Next, 3.33 parts by weight of a surface cross-linking agent aqueous solution [c003] was mixed with 100 parts by weight of the water absorbent resin powder [A030]. The aqueous surface crosslinking agent solution [c 003] is prepared by using 0.02 parts by weight of ethylene glycol diglycidyl ether, 0.2 parts by weight of 1,4-butanediol, 0.5 parts by weight of propylene glycol and 2.1 parts by weight of water. Become. The mixture was heat-treated in a mortar mixer heated to 175 ° C. for 40 minutes to obtain water-absorbing resin particles [A330] having a crosslinked surface. The water absorbent resin powder [A330] had a CRC (water absorption magnification) of 45.1 [g / g].

A water absorbing resin [A331] was obtained by adding 0.5 parts by weight of fumed silica AEROSIL 200 manufactured by Nippon Aerosil Co., Ltd. to 100 parts by weight of water absorbing resin particles [A330] and uniformly mixing.

[Example 6]
Add 1.0 part by weight of zinc stearate to 100 parts by weight of a water-absorbent resin [A331] and stir at 100 rpm for 25 minutes using a three-one motor (type 600G manufactured by Haydon Co., Ltd.) at 25 ° C and relative humidity 50% RH. Thus, a water absorbent resin [A332] was obtained. The water absorbing resin [A332] is shown in Table 1 below as the solidifying agent 9 of Example 6.

[Example 7]
In Example 6, it evaluated similarly except having made the quantity of the solidification agent 9 used for a solidification test into 102 g (120 g-15% weight loss), and a result is shown in following Table 1 below.

[Example 8]
The same evaluation as in Example 6 was conducted except that the amount of the solidifying agent 9 used in the solidification test was changed to 96 g (120 g to a 20% loss), and the results are shown in Table 1 below.

As described above, the waste liquid solidifying agent according to the present invention can be obtained from specific water absorbent resin particles, a substance having a specific hydrophobicity, and a hydrophilic substance. When the waste solution containing blood, body fluid and the like is solidified using the waste liquid solidifying agent of the present invention, a part of the waste liquid solidifying agent settles, a part floats, and at least a part of the floating solidifying agent settles However, because solidification proceeds from above and below the waste liquid by swelling while swelling at least partially while floating, especially when using a long container in the vertical direction, the time to solidify the whole waste liquid is significantly shortened It is possible to solidify with a small amount of solidifying agent used.

Claims (10)

A particulate solidifying agent for use in a method of treating a waste liquid which solidifies the waste liquid into a gel form by charging the waste liquid with a solidifying agent,
Seen containing a water-absorbent resin weight average particle diameter of 200μm or more 350μm or less, a hydrophobic substance and a hydrophilic substance is 0.05 wt% to 5 wt% methanol index of 100 or more relative to the water-absorbing resin ,
The waste liquid solidification agent whose water absorption magnification of the said water absorbing resin is 40 g / g or more . The waste liquid solidifying agent according to claim 1, wherein the hydrophobic substance is a fatty acid, fatty acid amide, fatty acid ester, fatty acid metal salt. The waste liquid solidifying agent according to claim 1 or 2 , wherein the number of carbon atoms in one molecule of the hydrophobic substance is 12 or more. Waste solution solidifying agent according to any one of claims 1 to 3 hydrophilic substance is inorganic particles. The waste solution solidifying agent according to any one of claims 1 to 4 , which contains 0.3% by weight or more and 3.0% by weight or less of the hydrophilic substance. A method for producing the solidifying agent in the form of particles used in a method of treating a waste liquid which solidifies the waste liquid into a gel form by charging a treatment agent to the waste liquid, the production method comprising acrylic acid and its salt as main components in to be obtained by polymerizing a monomer having a crosslinking structure, and to the water-absorbing resin particles the surface thereof has been cross-linked, 0.05 to 5.0% by weight of methanol index of 100 or more wherein the step of mixing the certain hydrophobic material and 0.3 wt% to 3.0 wt% of the hydrophilic material quality, the water-absorbent resin particles is adjusted to below 350μm weight average particle diameter of 200μm or more ,
The method for producing a waste liquid solidifying agent, wherein the water absorption capacity of the water absorbent resin is 40 g / g or more . 7. The method according to claim 6 , wherein the hydrophobic substance is a fatty acid, a fatty acid amide, a fatty acid ester or a fatty acid metal salt. The production method according to claim 6 or 7 , wherein the hydrophilic substance is inorganic fine particles. The method according to any one of claims 6 to 8 , wherein the inorganic fine particles are silicon dioxide and silicic acid (salt) having an average particle size of 200 μm or less. The manufacturing method in any one of Claims 6-9 including the process of granulating the fine powder of the said water absorbing resin.