JP6198535B2 - Waste liquid solidifying agent and method for producing waste liquid solidifying agent - Google Patents

Description

  The present invention relates to a waste liquid solidifying agent, a method for producing a waste liquid solidifying agent, and uses thereof.

In recent years, waste liquid discharged from various industrial fields has been increasing. Waste liquids include factory waste liquids, beverage waste liquids, and body fluid waste liquids. Liquid medical waste liquids containing amniotic fluid and blood that are discharged during surgery and childbirth in hospitals 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 the liquid is processed as it is, there is a risk of damage to the waste liquid container due to an accident or secondary infection due to the scattering of the waste liquid. 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, 0.90 mass% sodium chloride aqueous solution (physiological saline) mixed solution thereof, Ringer's solution waste solution for washing the affected area, ethanol disinfectant solution for disinfection, other disinfectant solution waste, artificial Examples include dialysis waste fluids, organs containing body fluids such as blood extracted from patients, and pathological examination waste fluids.
In the waste liquid treatment agent for solidifying these medical waste liquids, there are several methods (Patent Documents 1 and 2, etc.) for preventing the water absorption performance of the water absorbent resin from being deteriorated due to the electrolyte contained in blood or body fluid. Proposed. Patent Document 1 is a blend of an ionic water-absorbing resin and a nonionic water-absorbing resin. In Patent Document 2, a water-absorbing resin is blended with a substance that decreases the ionic strength of the electrolyte contained in the waste liquid, such as a chelating agent, an ion-exchange resin, or an ion-sensitive substance.

  However, due to the problem of the processing space, when water-absorbing resin is charged in a lump (post-injection into the waste liquid) to solidify the waste liquid accumulated in the vertically long waste liquid container, especially medical waste liquid, most of the water-absorbing resin from the specific gravity Since the solidification proceeds toward the upper waste liquid after sinking to the bottom of the container without floating, there is a problem that the water absorbent resin is unevenly distributed at the bottom of the container and cannot be sufficiently solidified to the top.

  Therefore, in order to shorten the solidification time of the waste liquid, a method for improving the water absorption speed by increasing the surface area of the water absorbent resin, such as foaming or microparticulation of the water absorbent resin, and a method for hydrophilizing the water absorbent resin have been proposed. . However, even if the water absorption rate of the water-absorbent resin is improved or hydrophilicized, a sufficient waste liquid solidification rate has not been obtained.

  Therefore, there is known a method of shortening the solidification time by mixing a hydrophobic substance into the water absorbent resin to float a part of the water absorbent resin and let the rest settle, thereby allowing the solidification to proceed from the top and bottom of the container. (Patent Document 3).

JP 2002-119853 A Japanese Patent Laid-Open No. 11-169451 International Publication No. 2005/107940

However, in the method of mixing a hydrophobic substance with a water-absorbent resin (Patent Document 3), when the concentration of electrolyte (blood, etc.) in the waste liquid is low (about 10%), solidification at the top and bottom of the vertically long container is relatively Although it can be made uniform, when the concentration of the electrolyte (blood, etc.) is high (about 30%), the water absorption rate becomes slow, resulting in a problem that the solidification property of the waste liquid decreases, the waste liquid tends to ooze out, and the solidified product becomes soft. It is easy to generate.
In this way, in the treatment method in which the waste liquid solidifying agent made of water-absorbing resin is added to solidify the waste liquid into a gel, the waste liquid solidifies with stable solidification performance regardless of the concentration of electrolyte (blood, etc.) in the waste liquid. The fact is that no agent has been obtained.
It is an object of the present invention to provide a waste liquid solidifying agent that has stable solidification performance regardless of the concentration of electrolyte (blood, etc.) in the waste liquid, the waste liquid in the solidified product hardly oozes out, and the solidified product is difficult to soften. And

The inventors of the present invention have arrived at the present invention as a result of intensive studies to obtain a waste liquid solidifying agent that has improved the above problems.
That is, the waste liquid solidifying agent of the present invention is an absorption comprising a cross-linked polymer (A) having a water-soluble vinyl monomer (a1) and / or a hydrolyzable vinyl monomer (a2) that becomes water-soluble by hydrolysis as an essential constituent unit. Liquid solidifying agent having a functional resin (X) and a surfactant (Y), wherein the HLB of (Y) is 5 to 12, and (Y) is solid at 25 ° C. and 10 ³ hPa. It is an agent.
In addition, the method for producing a waste liquid solidifying agent of the present invention comprises a crosslinked polymer (A) comprising a water-soluble vinyl monomer (a1) and / or a hydrolyzable vinyl monomer (a2) that becomes water-soluble by hydrolysis as an essential constituent unit. A waste liquid solidifying agent having an absorbent resin (X) and a surfactant (Y), wherein HLB of (Y) is 5 to 12, and (Y) is 25 ° C. and 10 ³ hPa. This is a method for producing a solid waste liquid solidifying agent.

The waste liquid solidifying agent of the present invention has an absorbent resin (X) and a surfactant (Y) that has a HLB of 5 to 12 and is solid at 25 ° C. and 10 ³ hPa. Even when the concentration of water is as high as about 30%, a highly hydrophilic surfactant (HLB of 5 to 12) is used, so that the water absorption speed is high. As a result, the solidification property of the waste liquid is good, and problems such as oozing out of the waste liquid and softening of the solidified product hardly occur.
Furthermore, even when the concentration of the electrolyte (blood, etc.) in the waste liquid is as thin as about 10%, the waste liquid solidifying agent of the present invention gradually settles while partly floating, so that the solidification property of the waste liquid is good. In addition, problems such as oozing out of the waste liquid and softening of the solidified product hardly occur. As a result, a waste liquid solidifying agent having stable solidification performance can be obtained regardless of the concentration of the electrolyte (blood, etc.) in the waste liquid.

The waste liquid solidifying agent of the present invention is an absorptive resin comprising a crosslinked polymer (A) having a water-soluble vinyl monomer (a1) and / or a hydrolyzable vinyl monomer (a2) that becomes water-soluble by hydrolysis as an essential constituent unit. A waste liquid solidifying agent having (X) and a surfactant (Y), wherein (Y) has an HLB of 5 to 12, and (Y) is solid at 25 ° C. and 10 ³ hPa.
By satisfying the above conditions, the waste liquid solidifying agent of the present invention hardly oozes out the waste liquid even when the concentration of the electrolyte in the waste liquid becomes high, and the solidified product does not easily become soft. In addition, the change in solidification due to changes in container size and blood concentration is reduced.

Waste liquid means medical waste liquid (blood and body fluids and their 0.90 mass% sodium chloride aqueous solution (physiological saline) mixed liquid, Ringer's liquid waste liquid for washing the affected area, disinfectant ethanol waste liquid, other disinfectant waste liquid, artificial dialysis Waste fluids, organs and pathological examination waste fluids such as blood extracted from patients, etc.), beverage waste fluids, factory waste fluids, radiation waste fluids, manure waste fluids, paint waste fluids, dental cleaning waste fluids, cleaning waste fluids for gastric cameras, and vomit Various waste liquids are included.
From the viewpoint of the waste liquid solidifying agent of the present invention, even if the concentration of the electrolyte in the waste liquid becomes high, the waste liquid does not easily bleed out, the solidified product is difficult to soften, and there is little change in solidification due to changes in container size and blood concentration. It is preferable for waste liquid containing blood, body fluid, and the like.

  The water-soluble vinyl monomer (a1) which is an essential constituent unit of the crosslinked polymer (A) and / or the hydrolyzable vinyl monomer (a2) which becomes water-soluble by hydrolysis are not particularly limited. And water-soluble radical polymerization monomers described in JP-075982. Among these, from the viewpoint of absorption performance, the water-soluble vinyl monomer (a1) is preferable, and more preferably an anionic vinyl monomer {vinyl monomer having an anionic group (carboxy group, sulfo group, phosphono group, hydroxyl group, etc.)}, Particularly preferably, the C3-C30 vinyl group-containing carboxylic acid (salt) {unsaturated monocarboxylic acid (salt) {(meth) acrylic acid, crotonic acid, cinnamic acid, and salts thereof}; unsaturated dicarboxylic acid ( Salt) (maleic acid, fumaric acid, citraconic acid, itaconic acid, and salts thereof); and monoalkyl (carbon number 1 to 8) ester of the unsaturated dicarboxylic acid (maleic acid monobutyl ester, fumaric acid monobutyl ester) , Ethyl carbitol monoester of maleic acid, ethyl carbitol monoester of fumaric acid, citraconic acid And butyl ester and itaconic acid glycol monoester}, then preferably the unsaturated monocarboxylic acid (salt), most preferably acrylic acid (salt).

  In addition, (meth) acrylic acid means acrylic acid and / or methacrylic acid, and "... acid (salt)" means "... acid" and / or "... acid salt". . Examples of the salt include alkali metal salts such as potassium, sodium and lithium, and alkaline earth metal salts such as calcium.

  When the water-soluble vinyl monomer (a1) unit contained in the crosslinked polymer (A) is an anionic vinyl monomer, this is a neutralized product (water-soluble vinyl monomer salt unit) even if it is an unneutralized product. However, a part or all of the water-soluble vinyl monomer (a1) unit is neutralized as a water-soluble vinyl monomer salt unit for the purpose of improving workability in producing the crosslinked polymer (A). Also good.

  When an anionic vinyl monomer is used as (a1), and an anionic portion derived from the anionic vinyl monomer contained in (A) is to be neutralized, potassium hydroxide, sodium hydroxide, lithium hydroxide, etc. An alkaline earth metal hydroxide such as an alkali metal hydroxide or calcium hydroxide or an aqueous solution thereof may be added to the monomer stage before polymerization or the hydrogel after polymerization.

  When an anionic vinyl monomer {most preferably acrylic acid (salt)} is used as the water-soluble vinyl monomer (a1) of the crosslinked polymer (A), the final neutralization degree of the anionic vinyl monomer {anionic vinyl The content (mol%) of the anionic base based on the total number of moles of the anionic group and anionic base of the monomer is preferably 30 to 100, more preferably 40 to 95, and particularly preferably 50 to 50 from the viewpoint of absorption performance. 90.

  Each of the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2) may be a single constituent monomer or two or more constituent monomers.

  Of the water-soluble vinyl monomer (a1) and hydrolyzable vinyl monomer (a2), (a1) is preferable from the viewpoint of absorption performance, and more preferably (a1) is used alone as a constituent monomer.

  When both the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2) are used as constituent units, the molar ratio {(a1) / (a2)} of these vinyl monomer units is 75/25 to 99 / 1, more preferably 85/15 to 95/5, particularly preferably 90/10 to 93/7, and most preferably 91/9 to 92/8. Within this range, the absorption performance is further improved.

  The cross-linked polymer (A) can further contain a water-soluble vinyl monomer (a1) and / or another vinyl monomer copolymerizable with the hydrolyzable vinyl monomer as a constituent unit, but the other vinyl monomer (a3). Is preferably not included as a structural unit.

The other vinyl monomer (a3) is not limited as long as it is a monomer that can be copolymerized with the water-soluble vinyl monomer (a1) and the like, and examples thereof include a vinyl monomer described in JP-A-2003-225565.
In the case where the other vinyl monomer (a3) is used as a constituent unit, the content (mol%) of the other vinyl monomer unit is selected from the viewpoint of absorption performance, the water-soluble vinyl monomer (a1) unit and the hydrolyzable vinyl monomer (a2). ) Based on the total number of moles of units, 0.01 to 30 is preferable, more preferably 0.05 to 20, and particularly preferably 0.1 to 15.

In the present invention, when (a1) and / or (a2), which is an essential constituent unit, has a reactive group in the crosslinked polymer (A) (a combination of a carboxyl group and an amino group). Although self-crosslinking may be performed, an internal crosslinking agent (b) may be used if necessary.
As the internal cross-linking agent (b), a known internal cross-linking agent, for example, an internal cross-linking agent described in JP-A No. 2003-225565 can be used. Of these internal cross-linking agents, an internal cross-linking agent having two or more ethylenically unsaturated groups is preferable from the viewpoint of absorption performance, and more preferably triallyl cyanurate, triallyl isocyanurate, and those having 2 to 10 carbon atoms. Poly (meth) allyl ethers of polyols, particularly preferably triallyl cyanurate, triallyl isocyanurate, tetraallyloxyethane and pentaerythritol triallyl ether, most preferably pentaerythritol triallyl ether.

  The content (mol%) of the internal crosslinking agent (b) is preferably 0.001 to 5, more preferably, based on the number of moles of the water-soluble vinyl monomer (a1) unit and the hydrolyzable vinyl monomer (a2) unit. Is 0.005 to 3, particularly preferably 0.01 to 1. Within this range, the absorption characteristics are further improved.

  The crosslinked polymer (A) is prepared in the same manner as in known methods {Japanese Patent Laid-Open No. 2003-225565 and Japanese Patent Laid-Open No. 2005-075982 etc.} and a water-soluble vinyl monomer (a1) and / or a hydrolyzable vinyl monomer ( a2) and the internal crosslinking agent (a3) are polymerized to prepare a hydrogel, and if necessary, the hydrogel may be shredded and dried to obtain a crosslinked polymer (A).

  The crosslinked polymer (A) can be pulverized after drying. The pulverization method is not particularly limited, and a normal pulverizer (for example, a hammer-type pulverizer, an impact-type pulverizer, a roll-type pulverizer, and a shet airflow-type pulverizer) can be used. The pulverized absorbent resin particles can be adjusted in particle size by sieving if necessary.

  When the crosslinked polymer (A) is a pulverized water-absorbent resin particle, the weight average particle diameter (μm) of (A) is such that the waste liquid is difficult to bleed out even when the concentration of the electrolyte in the waste liquid increases. Is preferably 100 to 2000, more preferably 200 to 1000, and particularly preferably 300 to 850, from the viewpoint of being difficult to become soft.

  The crosslinked polymer (A) may be subjected to a crosslinking treatment by reacting a surface crosslinking agent as necessary.

As the surface crosslinking agent, a known surface crosslinking agent, for example, a surface crosslinking agent described in JP-A-2003-225565 can be used.
Among these surface cross-linking agents, from the viewpoint of water absorption performance and the like, the water-soluble substituent {carboxy group, hydroxyl group, etc.} of the water-soluble vinyl monomer (a1) unit and / or the hydrolysis of the hydrolyzable vinyl monomer (a2) unit. Is preferably a cross-linking agent having at least two functional groups capable of reacting with water-soluble substituents {carboxy group, hydroxyl group, etc.} generated by the above, more preferably polyvalent glycidyl, particularly preferably ethylene glycol diglycidyl ether and glycerin diglycidyl. Ether, most preferably ethylene glycol diglycidyl ether.

  The content (mol%) of the surface cross-linking agent is selected from the viewpoints that the waste liquid does not ooze out and the solidified product is difficult to soften even if the concentration of the electrolyte in the waste liquid becomes high. Based on the number of moles of the vinyl monomer (a2) unit, 0.005 to 0.300 is preferable, 0.010 to 0.200 is more preferable, and 0.015 to 0.15 is particularly preferable.

  As the method of the surface crosslinking reaction, known methods (for example, Japanese Patent No. 3648553, Japanese Patent Application Laid-Open No. 2003-165883, Japanese Patent Application Laid-Open No. 2005-75982, Japanese Patent Application Laid-Open No. 2005-95759) can be applied.

The waste liquid solidifying agent of the present invention is a waste liquid solidifying agent having an absorbent resin (X) composed of the crosslinked polymer (A) and a surfactant (Y).
In the present invention, the surfactant (Y) has an HLB of 5 to 12 and is solid at 25 ° C. and 10 ³ hPa.
Here, “HLB” is an index indicating the balance between hydrophilicity and lipophilicity, and is described, for example, in “Introduction to Surfactants” (published by Sanyo Chemical Industries, Ltd., 2007, Takehiko Fujimoto), page 212. By the Oda method, it can be calculated from the ratio between the organic value and the inorganic value of the organic compound.
The organic value and the inorganic value for deriving HLB = 10 × inorganic / organic HLB can be calculated by using the values in the table described in “Introduction of Surfactant” on page 213.
If the HLB of the surfactant (Y) exceeds 12 and the hydrophilicity becomes high, the electrolyte (blood, etc.) will sink to the bottom of the container in a relatively short time when the concentration of the electrolyte (blood, etc.) is reduced to about 10%. Further, it takes a long time to solidify the waste liquid containing the electrolyte (blood, etc.), and water separation tends to occur in the solidified state.
If the HLB of the surfactant (Y) is less than 5 and the hydrophobicity becomes strong, when the concentration of the electrolyte (blood, etc.) is increased to about 30%, the water absorption rate becomes slow, the solidification property of the waste liquid is lowered, and the waste liquid is reduced. It becomes easy to ooze out.

The surfactant (Y) includes a nonionic surfactant having an HLB of 5 to 12 and a solid at 25 ° C. and 10 ³ hPa.
Nonionic surfactants do not exhibit ionic properties even when dissolved in water, but exhibit surface activity. In the present invention, the nonionic surfactant includes a nonionic surfactant having a known HLB of 5 to 12 and solid at 25 ° C. and 10 ³ hPa.
Nonionic surfactants include sucrose fatty acid esters, sorbitan fatty acid esters, glycerin fatty acid esters, and fatty acid amides from the viewpoint that the waste liquid does not easily bleed out and the solidified product is difficult to soften even when the electrolyte concentration in the waste liquid increases. At least one selected from the group consisting of

  Sucrose fatty acid esters include those in which a fatty acid having 8 to 22 carbon atoms is ester-bonded to sucrose, and specifically, sucrose stearic acid esters [for example, those manufactured by Daiichi Kogyo Seiyaku Co., Ltd. {DK Ester F-50 (HLB = 6), F-70 (HLB = 8), F-110 (HLB = 11), etc.], manufactured by Mitsubishi Chemical Foods, Inc. {Ryoto Sugar Ester S-770 (HLB = about 7), S-970 (HLB = about 9), S-1170 (HLB = about 11), S-1170F (HLB = about 11), etc.}, etc.].

  Sorbitan fatty acid esters include those in which a fatty acid having 8 to 22 carbon atoms is ester-bonded to sorbitan. Specifically, sorbitan palmitate [manufactured by Kao Corporation {Leodol SP-P10 (HLB = 6. 7) etc. and those manufactured by Riken Vitamin Co., Ltd. {Riquemar P-300 (HLB = 5.6) etc.} etc.] and the like.

Examples of the glycerin fatty acid ester include glycerin and / or a polymer of glycerin (degree of polymerization 2 to 20) in which a fatty acid having 8 to 22 carbon atoms is ester-bonded.
Specifically, diglycerin monolaurate [made by Riken Vitamin Co., Ltd. {Poem DL-100 (HLB = 9.4), etc.] etc.], diglycerin monomyristate [made by Riken Vitamin Co., Ltd. {Poem DM-100 (HLB = 8.7) etc.}], diglycerin monostearate [manufactured by Riken Vitamin Co., Ltd. {Poem DS-100A (HLB = 7.7) etc.} etc.], diglycerin Monooleate [manufactured by Riken Vitamin Co., Ltd. {Poem DO-100V (HLB = 7.3), Riquemar DO-100 (HLB = 7.4), etc.)], decaglycerin stearate [RIKEN Vitamin Co., Ltd.] And the like {Poem J-0081HV (HLB = 12), Poem J-0381V (HLB = 12), etc.}] and the like.

  Examples of the fatty acid amide include those obtained by amide bonding of a fatty acid having 8 to 22 carbon atoms and ethanolamine. Specifically, palm oil fatty acid monoethanolamide [manufactured by Sanyo Chemical Industries, Ltd. {Prophan AB-20 (HLB = 11), etc.] etc.], stearic acid monoethanolamide [manufactured by Sanyo Chemical Industries, Ltd. {Profan SME (HLB = 10) etc.} etc.] and the like.

  The HLB of (Y) is preferably 6 to 11 from the viewpoint that the waste liquid hardly oozes out and the solidified product hardly softens regardless of the concentration of the electrolyte (blood, etc.) in the waste liquid.

In the waste liquid solidifying agent of the present invention, the content of the surfactant (Y) is based on the weight of the water-absorbent resin (X), and even if the concentration of the electrolyte in the waste liquid becomes high, the waste liquid hardly oozes and the solidified product Is preferably 0.1 to 5.0% by weight, more preferably 0.2 to 4.5% by weight, and still more preferably 0.3 to 4.0% by weight. Particularly preferred is 0.5 to 3.5% by weight.
When the surfactant (Y) content is 0.1% by weight or more, the electrolyte (blood, etc.) hardly sinks to the bottom of the container when the concentration of the electrolyte (blood, etc.) is reduced to about 10%. This is preferable because it does not take a long time to solidify the waste liquid containing, and the solidified state hardly causes water separation.
When the content of the surfactant (Y) is 5.0% by weight or less, the water absorption rate does not slow down when the concentration of the electrolyte (blood, etc.) is increased to about 30%, and the solidification property of the waste liquid Since the liquid does not decrease, the waste liquid hardly oozes out, which is preferable.

  When the shape of the surfactant (Y) is powder, the particle size of the surfactant is not particularly limited, but the weight average particle size is 2000 μm from the viewpoint of dry blendability to the water absorbent resin. Or less, more preferably 1500 μm or less, and still more preferably 1000 μm or less.

The waste liquid solidifying agent of the present invention is a waste liquid solidifying agent having a water-absorbent resin (X) and a surfactant (Y), and the waste liquid is difficult to ooze regardless of the concentration of the electrolyte (blood, etc.) in the waste liquid. From the viewpoint of hardening the solidified product, it is preferable to have a surfactant (Y) in the vicinity of the surface of the water absorbent resin (X).
As what has surfactant (Y) in the surface vicinity of water absorbing resin (X), what was obtained by the following method is mentioned.
(1) A method of directly mixing a surfactant (Y), which is a solid, with the water-absorbent resin (X) as it is, for example, a dry blend method. (2) A surfactant (Y) in water or a hydrophilic organic solvent. (3) The surfactant (Y) is dissolved in a hydrophobic organic solvent, impregnated with the water absorbent resin (X), and dried. Among these mixing methods, (1) is preferred from the viewpoint of ease of drying and a small amount of residual solvent.

In the waste liquid solidifying agent of the present invention, an optional step {in the production step of the crosslinked polymer (A), a polymerization step, a shredding step, a drying step, a pulverization step, a surface crosslinking step, and / or before and after these steps. And after the step of mixing (X) and (Y), etc.}, an additive can be added.
As additives, known additives (for example, Japanese Patent Application Laid-Open No. 2003-225565) {preservatives, fungicides, antibacterial agents, antioxidants, ultraviolet absorbers, colorants, fragrances, deodorants, and organic fibers Etc.}, etc., and one or more of these may be used in combination.

In the waste liquid solidifying agent of the present invention, the wet time (I) shown below is preferably 20 to 90 seconds, more preferably 25 to 80 seconds, from the viewpoint of waste liquid solidification.
Nure time (I): 1.00 g of waste liquid solidifying agent is charged all at once into a beaker having an effective volume of 100 ml (inner diameter 50 mm) containing 50 g of 0.90 wt% sodium chloride aqueous solution at 25 ° C. Time to do.
When the wet time (I) is 20 seconds or longer, the electrolyte (blood) does not sink to the bottom of the container in a relatively short time when the concentration of the electrolyte (blood, etc.) is reduced to about 10%. It is preferable that solidification of the waste liquid containing the above-mentioned) does not take a long time, and that the solidified state hardly causes water separation.
Since the wet time (I) is 90 seconds or less, when the concentration of the electrolyte (blood, etc.) increases to about 30%, the water absorption speed does not slow down and the waste liquid solidification property does not decrease. The waste liquid is preferable because it does not easily ooze out.
Therefore, by setting the wet time (I) within the above range, the water absorption magnification and the absorption speed become appropriate, and the waste liquid can be solidified regardless of the size of the container.

Specifically, the wet time (I) is measured by the following measuring method.
For the apparent density measurement described in JIS-K3362 on top of a beaker (inner diameter 50 mm, height 70 mm) with an effective capacity of 100 ml placed with a 0.90 mass% sodium chloride aqueous solution at 25 ° C. placed vertically. The funnel is installed so that the height from the liquid level of the lower mouth is 50 mm. With the lower mouth of the funnel open, 1.00 g of the waste liquid solidifying agent is gently put into the funnel, and the time from the introduction of the waste liquid solidifying agent to the wetting of the waste liquid solidifying agent is measured. The time when the appearance of the waste liquid solidifying agent becomes transparent is determined as the time when it is wet.

In the waste liquid solidifying agent of the present invention, the wet time (II) shown below is preferably 80 to 500 seconds, more preferably 100 to 400 seconds, from the viewpoint of waste liquid solidification.
Waste time (II): Waste liquid solidifying agent 1 in a beaker having an effective volume of 100 ml (inner diameter 50 mm) containing 50 g of an aqueous solution at 25 ° C. containing 0.9 wt% sodium chloride and 10 wt% bovine blood containing the following anticoagulant The time from when .00 g is charged all at once until the waste liquid solidifying agent gets wet.
Bovine blood containing anticoagulant: Bovine blood obtained by adding 200 ml of 0.5 M sodium ethylenediaminetetraacetate solution adjusted to pH 8.0 to 4000 ml of bovine blood.
Preparation Method of 0.5 M Sodium Ethylenediaminetetraacetate Aqueous Solution 37.2 g of disodium ethylenediaminetetraacetate dihydrate was added to 160 ml of water, and then sodium hydroxide was added to adjust the pH to 8.0. In addition, 200 ml of 0.5 M aqueous solution of sodium ethylenediaminetetraacetate is prepared.
When the wet time (II) is 80 seconds or more, when the concentration of the electrolyte (blood, etc.) is reduced to about 10%, the electrolyte (blood, etc.) does not sink to the bottom of the container in a short time. It is preferable because it does not take a long time to solidify the waste liquid containing, and the solidified state hardly causes water separation.
When the wet time (II) is 500 seconds or less, when the concentration of the electrolyte (blood, etc.) is increased to about 30%, the water absorption speed is moderate, and the waste liquid bleeds without decreasing the solidification property of the waste liquid. It is hard to come out and is preferable.
Therefore, by setting the wet time (II) in the above range, the water absorption magnification and the absorption speed become appropriate, and the waste liquid can be solidified regardless of the size of the container.

Specifically, the measurement is performed by the following measurement method.
A beaker with an effective volume of 100 ml (with an inner diameter of 50 mm and a height of 70 mm) containing 50 g of an aqueous solution at 25 ° C. containing 0.9% by weight of sodium chloride and 10% by weight of bovine blood containing the above-mentioned anticoagulant (with an inner diameter of 50 mm and a height of 70 mm). ), The funnel for measuring the apparent density described in JIS-K3362 is installed so that the height from the liquid level of the lower mouth is 50 mm, and the lower mouth of the funnel is opened. Gently add 1.00 g of the waste liquid solidifying agent, and measure the time from the introduction of the waste liquid solidifying agent until the waste liquid solidifying agent becomes wet. The time when the appearance of the waste liquid solidifying agent becomes transparent is determined as the time when it is wet.

In the waste liquid solidifying agent of the present invention, the wet time (III) shown below is preferably from 300 to 1800 seconds, more preferably from 400 to 1500 seconds, from the viewpoint of waste liquid solidification.
Waste time (III): Waste liquid solidifying agent in a beaker having an effective volume of 100 ml (inner diameter 50 mm) containing 50 g of an aqueous solution at 25 ° C. containing 0.9% by weight of sodium chloride and 30% by weight of bovine blood containing the following anticoagulant The time from when 1.00 g is charged all at once until the waste liquid solidifying agent gets wet.
Bovine blood containing anticoagulant: Bovine blood obtained by adding 200 ml of 0.5 M sodium ethylenediaminetetraacetate solution adjusted to pH 8.0 to 4000 ml of bovine blood.
When the wet time (III) is 300 seconds or more, when the concentration of the electrolyte (blood, etc.) is reduced to about 10%, the electrolyte (blood, etc.) does not sink to the bottom of the container in a short time. It is preferable because it does not take a long time to solidify the waste liquid containing, and the solidified state hardly causes water separation.
When the wet time (III) is 1800 seconds or less, when the concentration of the electrolyte (blood, etc.) is increased to about 30%, the water absorption speed is moderate, and the waste liquid is bleed without decreasing the solidification property of the waste liquid. It is hard to come out and is preferable.
Therefore, by setting the wet time (III) in the above range, the water absorption magnification and the absorption speed become appropriate, and the waste liquid can be solidified regardless of the size of the container.

Specifically, the measurement is performed by the following measurement method.
A beaker with an effective volume of 100 ml (with an inner diameter of 50 mm and a height of 70 mm) containing 50 g of an aqueous solution at 25 ° C. containing 0.9% by weight of sodium chloride and 30% by weight of bovine blood containing the above-mentioned anticoagulant and placed in the axial direction vertical. ), The funnel for measuring the apparent density described in JIS-K3362 is installed so that the height from the liquid level of the lower mouth is 50 mm, and the lower mouth of the funnel is opened. Gently add 1.00 g of the waste liquid solidifying agent, and measure the time from the introduction of the waste liquid solidifying agent until the waste liquid solidifying agent becomes wet. The time when the appearance of the waste liquid solidifying agent becomes transparent is determined as the time when it is wet.

The physiological saline absorption capacity of the waste liquid solidifying agent of the present invention is preferably 45 to 65 g / g, more preferably 46 to 64 g / g, with respect to physiological saline (25 ° C.), from the viewpoint of waste liquid solidification. More preferably, it is 47 to 63 g / g, and most preferably 48 to 62 g / g.
The physiological saline absorption capacity can be decreased by increasing the amount of internal and / or surface cross-linking of the water-absorbent resin (X), and can be increased by decreasing the amount of internal and / or surface cross-linking. Can be made.
The method for measuring the absorption rate of physiological saline is as follows.

<Measurement method of saline water absorption magnification>
A sample of waste liquid solidifying agent (sample amount: 0.1 g) is placed in a nylon net bag (250 mesh) having a length of 20 cm, a width of 10 cm, and a width of about 5 mm, and the bag is filled with excess physiological saline (25 ° C.). Soak in. After 60 minutes of immersion, the whole bag is pulled up in the air, left to stand and drained for 30 minutes, and then the mass (Sg) is measured to determine the absorption capacity from the following formula.
[The same operation as described above is performed using only a net bag, and the mass (Tg) of this portion is used as a blank. ]
Saline absorption rate = (ST) /0.1

In the waste liquid solidifying agent of the present invention, the absorbed amount under load of physiological saline is preferably 10 to 40 g / g, more preferably 10 to 35 g from the viewpoint of waste liquid solidification.
The method for measuring the amount of absorbed saline under load is as follows.
[Measurement method of absorbed amount under load of physiological saline]
0.16 g of a measurement sample sieved to a particle diameter of 250 to 500 μm in a cylindrical plastic tube (inner diameter: 25 mm, height: 34 mm) having a nylon mesh of 63 μm (JIS Z8801-1: 2006) pasted on the bottom. The sample was weighed and the cylindrical plastic tube was placed vertically to arrange the measurement sample on the nylon mesh so that the thickness of the measurement sample was almost uniform, and a weight (weight: 200 g, outer diameter: 24.5 mm, ). After measuring the weight (M1) of the entire cylindrical plastic tube, a cylindrical plastic tube containing a measurement sample and a weight was placed vertically in a petri dish (diameter: 12 cm) containing 60 ml of physiological saline. Dip with side down and let stand for 60 minutes. After 60 minutes, pull up the cylindrical plastic tube from the petri dish, tilt it diagonally, remove the dripping water drops, weigh the entire cylindrical plastic tube containing the measurement sample and weight (M2), and Obtain the amount absorbed under load. In addition, the temperature of the physiological saline used and measurement atmosphere is 25 degreeC.
Absorption amount under load of physiological saline (g / g) = {(M2) − (M1)} / 0.16

  The weight average particle diameter (μm) of the waste liquid solidifying agent of the present invention is preferably from 100 to 800, more preferably from the viewpoint that the waste liquid does not easily exude even when the concentration of the electrolyte in the waste liquid becomes high and the solidified product is difficult to soften. Is 200 to 500, particularly preferably 300 to 400.

The bulk specific gravity (specified in US Pat. No. 6,562,879) of the waste liquid solidifying agent of the present invention is preferably 0.5 to 0.8 g / cm ³ and more preferably 0.55 to 0.75 g from the viewpoint of waste liquid solidification. / Cm ³ .

The method for producing a waste liquid solidifying agent of the present invention comprises a crosslinked polymer (A) having a water-soluble vinyl monomer (a1) and / or a hydrolyzable vinyl monomer (a2) that becomes water-soluble by hydrolysis as an essential constituent unit. A method for producing a waste liquid solidifying agent having an absorbent resin (X) and a surfactant (Y), wherein the HLB of (Y) is 5 to 12, and (Y) is solid at 25 ° C. and 10 ³ hPa. This is a method for producing a certain waste liquid solidifying agent.

In the production method of the present invention, the preferred water-soluble vinyl monomer (a1), hydrolyzable vinyl monomer (a2) and surfactant (Y) are the same as described above.
Further, the cross-linked polymer (A) may contain the internal cross-linking agent (b) as a structural unit as necessary, and preferred as (b) is the same as described above.

  The manufacturing method of this invention includes the said process (I). In this step, by mixing the water absorbent resin (X) and the surfactant (Y), the surfactant (Y) adheres to the surface of the water absorbent resin (X), and the electrolyte (blood, etc.) in the waste liquid ), It is possible to obtain a waste liquid solidifying agent having a stable solidification performance regardless of the light and shade of ().

Examples of the method for mixing the surfactant (Y) include the following.
(1) A method of directly mixing a surfactant (Y), which is a solid, with the water-absorbent resin (X) as it is, for example, a dry blend method. (2) A surfactant (Y) in water or a hydrophilic organic solvent. (3) Method of dissolving the surfactant (Y) in a hydrophobic organic solvent and impregnating the water absorbent resin (X) Among these mixing methods, (1) is preferable from the viewpoint of ease of drying and reduction of residual solvent.

In the production method of the present invention, it is preferable that the following step (I) is further included from the viewpoint of waste liquid solidification.
Step (I): Step of crosslinking the surface of the crosslinked polymer (A)

  The step (I) may be performed before the mixing of the surfactant, at the same time as the mixing of the surfactant, or after the mixing of the surfactant. Among these, from the viewpoint of waste liquid solidification, it is preferable to mix the surfactant.

  In the production method of the present invention, when step (I) is included, a preferred specific embodiment is that a surface cross-linking agent solution in which a surface cross-linking agent and water and, if necessary, a hydrophilic organic solvent or an inorganic substance such as inorganic sodium alum is mixed is used. After the treatment, the surfactant (Y) is dry blended and mixed with the water absorbent resin (X).

The waste liquid solidification method of the present invention is a waste liquid treatment method in which a waste liquid is solidified into a gel by introducing a waste liquid solidification agent into the waste liquid, and the waste liquid solidification agent is the waste liquid solidification agent of the present invention. .
The waste liquid solidifying agent of the present invention can be used for solidifying various waste liquids such as beverage waste liquids, factory waste liquids, radiation waste liquids, manure waste liquids, and the waste liquids may contain organic substances, solid dispersions, etc. From solidification, it is preferably used for solidification of medical waste liquids that have many conventional problems. The waste liquid refers to an aqueous liquid for disposal or a filtered aqueous liquid.
By using the waste liquid solidification method of the present invention using the waste liquid solidifying agent of the present invention, a stable solidification performance can be obtained regardless of the concentration of the electrolyte (blood, etc.) in the waste liquid. It is difficult to harden the solidified product.

  As the solidification method of the present invention, various container shapes (longitudinal, laterally long, etc.) and solidifying agent charging methods (collective charging / split charging to waste liquid, pre-loading / post-charging to waste liquid) can be widely applied. Since the waste liquid solidifying agent of the present invention has a stable solidification performance regardless of the concentration of the electrolyte (blood, etc.) in the waste liquid, it has conventionally been difficult to solidify depending on the concentration of the electrolyte (blood, etc.) in the waste liquid. It is preferably used for solidifying the waste liquid in a vertically long container. In addition, as a charging method, a stable charging performance can be expected regardless of the concentration of the electrolyte (blood, etc.) in the waste liquid, and batch charging is preferable. The powder may be charged as it is, or it may be charged in a state where the waste liquid solidifying agent is placed in a water-soluble, water-disintegrating or water-permeable container or bag.

  The waste liquid solidifying agent introduced into the waste liquid sinks regardless of the concentration of the electrolyte (blood, etc.) in the waste liquid, but the rest floats and solidifies from above and below the waste liquid. When a container having a long direction is used, the time until the entire waste liquid is solidified can be remarkably shortened. Further, since the suspended waste liquid solidifying agent gradually settles while absorbing the waste liquid, there is an effect that the time until the entire waste liquid is solidified is shortened. Furthermore, regardless of the concentration of the electrolyte (blood, etc.) in the waste liquid, stable solidification performance can be expected, and the waste liquid in the solidified product is unlikely to bleed out, and the solidified product is difficult to soften.

The waste liquid solidification packaging body of the present invention is formed by filling the waste liquid solidification agent of the present invention. The shape and material of the package of the present invention are not particularly limited.
As the size of the package, it is preferable that 10 to 1,000 g of the waste liquid solidifying agent can be sealed, a part of which can be opened and the liquid waste solidifying agent can be taken out therefrom. And a water-permeable packaging body.
Examples of the poly wide-mouthed bottle include a poly wide-mouthed bottle with soft packing (commercially available, for example, those described in the catalog 800 manufactured by Terraoka Research Equipment; material polyethylene, etc.).

EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not limited to this. In addition, a part shows a weight part below. Hereinafter, Example 11 is referred to as Reference Example 1.

[Example 1]
To a 1 L beaker, 230.4 g (3.2 mol) of acrylic acid, 1.0 g (3.9 mmol) of pentaerythritol triallyl ether as a crosslinking agent, and 1001.7 g of water were added and cooled to 10 ° C. This solution was put into an adiabatic polymerization tank, and dissolved oxygen of the solution was adjusted to 0.1 ppm (measured with a trade name dissolved oxygen meter DO220PB, manufactured by Orient Electric Co., Ltd.) through nitrogen, and then 35% excess as a polymerization initiator. 0.023 g of hydrogen oxide water, 0.00575 g of L-ascorbic acid, and 0.23 g of potassium persulfate were added. After about 30 minutes, the polymerization reaction started and, after about 2 hours, the maximum temperature of 60 ° C. was reached. Further, the polymerization was completed by aging at this temperature for 5 hours. The obtained polymer had a hydrogel form. The polymer was stirred for about 2 hours with a kneader (trade name BENCH KNEEADERPNV-1; manufactured by Irie Shokai Co., Ltd .; rotational speed 70 rpm), and further blended with 192.0 g of a 48% sodium hydroxide aqueous solution. The mixture was stirred for about 2 hours with a kneader to obtain a hydrogel polymer (A1). Thereafter, it is dried at 120 ° C. for 1 hour using a band dryer (air-permeable dryer, manufactured by Inoue Metal Co., Ltd.), pulverized with a commercially available juicer mixer, and sieved using a sieve having an opening of 850 and 106 μm. After adjusting to a particle size of 850 μm, 100 parts of this was stirred at high speed (manufactured by Hosokawa Micron Corporation, high-speed stirring turbulizer: rotation speed: 2000 rpm), and a 10 wt% water / methanol mixed solution (water / methanol / diglycidyl ether). 2 parts (0.1 mol%) of methanol (weight ratio = 70/30) were added while being sprayed and mixed. This mixture was allowed to stand at 140 ° C. for 30 minutes and subjected to heat crosslinking (surface crosslinking) to thereby obtain an absorbent resin having a weight average particle diameter of 370 μm (manufactured by Nikkiso Co., Ltd., trade name: measured with Microtrac FRA particle size analyzer). X1) was obtained. (X1) After adding 100 parts in a Nauter type mixer and adding 0.8 parts of Ryoto Sugar Ester S-1170 (Mitsubishi Chemical Foods, sucrose stearate, HLB11) while stirring the powder , (X1) and Ryoto sugar ester S-1170 were stirred for 30 minutes while being kept at 80 to 90 ° C., and uniformly mixed. Thereafter, the water content was adjusted to 4.5% by weight to obtain a waste liquid solidifying agent (1). In addition, when the moisture content is lower than 4.5 wt%, it is adjusted by spraying water. When the moisture content is higher than 4.5 wt%, the pressure is reduced to 100 to 150 mmHg while keeping at 50 to 60 ° C. Adjustment was performed by removing excess water.

[Example 2]
In Example 1, except that the addition amount of Ryoto Sugar Ester S-1170 (Mitsubishi Chemical Foods Co., Ltd., sucrose stearate, HLB11) was changed from “0.8 part” to “0.5 part”. Performed the same operation as in Example 1 to obtain a waste liquid solidifying agent (2).

[Example 3]
In Example 1, except that the addition amount of Ryoto Sugar Ester S-1170 (Mitsubishi Chemical Foods Co., Ltd., sucrose stearate, HLB11) was changed from “0.8 parts” to “1.5 parts”. Performed the same operation as in Example 1 to obtain a waste liquid solidifying agent (3).

[Example 4]
In Example 1, a 10 wt% water / methanol mixed solution of ethylene glycol diglycidyl ether (water / methanol weight ratio = 70/30) was changed from “2 parts (0.1 mol%)” to “3 parts (0. 15 mol%) ”, and the addition amount of Ryoto Sugar Ester S-1170 (Mitsubishi Chemical Foods, sucrose stearate, HLB11) is changed from“ 0.8 part ”to“ 1.0 part ”. Except for the change, the same operation as in Example 1 was performed to adjust the water content to 4.5% by weight to obtain a waste liquid solidifying agent (4).

[Example 5]
In Example 1, instead of “Ryoto Sugar Ester S-1170 (manufactured by Mitsubishi Chemical Foods, Inc., sucrose stearate, HLB11) 0.8 part”, “Ryoto Sugar Ester S-970 (Mitsubishi Chemical) A waste liquid solidifying agent (5) was obtained by performing the same operation as in Example 1 except that 0.6 parts by sucrose stearate, HLB9) manufactured by Foods Corporation was used.

[Example 6]
In Example 1, a 10 wt% water / methanol mixed solution of ethylene glycol diglycidyl ether (water / methanol weight ratio = 70/30) was changed from “2 parts (0.1 mol%)” to “3 parts (0. Instead of “Ryoto Sugar Ester S-1170 (manufactured by Mitsubishi Chemical Foods, Inc., sucrose stearate ester, HLB11) 0.8 part”. A waste liquid solidifying agent (6) was obtained in the same manner as in Example 1 except that 1.0 part (manufactured by Mitsubishi Chemical Foods Corporation, sucrose stearate ester, HLB9) was used.

[Example 7]
In Example 1, instead of “0.8 parts of Ryoto Sugar Ester S-1170 (Mitsubishi Chemical Foods, sucrose stearate, HLB11)”, “Ryoto Sugar Ester S-770 (Mitsubishi Chemical) A waste liquid solidifying agent (7) was obtained in the same manner as in Example 1 except that 0.8 parts by sucrose stearate ester, HLB7) manufactured by Foods Corporation was used.

[Example 8]
Instead of “Ryoto Sugar Ester S-1170 (manufactured by Mitsubishi Chemical Foods Co., Ltd., sucrose stearate ester, HLB11) 0.8 part” in Example 1, “Riquemar P-300 (RIKEN Vitamin Co., Ltd.)” The same operation as in Example 1 was performed except that 1.0 part of palmitate sorbitan ester, HLB 5.6) was used to obtain a waste liquid solidifying agent (8).

[Example 9]
Instead of “Ryoto Sugar Ester S-1170 (manufactured by Mitsubishi Chemical Foods, Ltd., sucrose stearate, HLB11) 0.8 part” in Example 1, “Riquemar S-71-D (RIKEN Vitamin ( The same operation as in Example 1 was carried out except that 1.0 part by stearic acid diglycerin ester, HLB 5.4) was obtained, and a liquid waste solidifying agent (9) was obtained.

[Example 10]
In Example 1, except that the addition amount of Ryoto Sugar Ester S-1170 (Mitsubishi Chemical Foods Co., Ltd., sucrose stearate, HLB11) was changed from “0.8 part” to “0.3 part”. Performed the same operation as in Example 1 to obtain a waste liquid solidifying agent (10).

[Example 11]
Instead of “Ryoto Sugar Ester S-1170 (manufactured by Mitsubishi Chemical Foods Co., Ltd., sucrose stearate ester, HLB11) 0.8 part” in Example 1, “Riquemar P-300 (RIKEN Vitamin Co., Ltd.)” The same operation as in Example 1 was carried out except that 0.1 part by palmitic acid sorbitan ester, HLB 5.6) was used to obtain a waste liquid solidifying agent (11).

[Example 12]
In Example 1, a 10 wt% water / methanol mixed solution of ethylene glycol diglycidyl ether (water / methanol weight ratio = 70/30) was changed from “2 parts (0.1 mol%)” to “3 parts (0. Instead of “Ryoto Sugar Ester S-1170 (manufactured by Mitsubishi Chemical Foods, Inc., sucrose stearate ester, HLB11) 0.8 part”. A waste liquid solidifying agent (12) was obtained by performing the same operation as in Example 1 except that 0.4 part (Mitsubishi Chemical Foods Co., Ltd., sucrose stearate, HLB9) was used.

[Comparative Example 1]
To a 1 L beaker, 230.4 g (3.2 mol) of acrylic acid, 0.5 g of pentaerythritol triallyl ether as a crosslinking agent, and 1001.7 g of water were added and cooled to 10 ° C. This solution was put into an adiabatic polymerization tank, and dissolved oxygen of the solution was adjusted to 0.1 ppm (measured with a product name dissolved oxygen meter DO220PB, manufactured by Orient Electric Co., Ltd.) through nitrogen, and then 35% by weight as a polymerization initiator. Hydrogen peroxide water 0.023 g, L-ascorbic acid 0.00575 g, and potassium persulfate 0.23 g were added. After about 30 minutes, the polymerization reaction started and, after about 2 hours, the maximum temperature of 60 ° C. was reached. Further, the polymerization was completed by aging at this temperature for 5 hours. The obtained polymer had a hydrogel form. The polymer was stirred for about 2 hours with a kneader (trade name BENCH KNEEADERPNV-1; manufactured by Irie Shokai Co., Ltd .; rotation speed: 70 rpm) and further chopped, and further 192.0 g of a 48 wt% sodium hydroxide aqueous solution (neutralized) 72%), and the mixture was stirred for about 2 hours with a kneader. Then, it was dried at 120 ° C. for 1 hour using a band dryer (air-permeable dryer, manufactured by Inoue Metal Co., Ltd.), pulverized with a commercially available juicer mixer, and weight average using a sieve having an opening of 850 and 106 μm. The absorbent resin (X2) was obtained by adjusting the particle size to 370 μm and adjusting the water content to 4.5% by weight. This was used as a comparative waste liquid solidifying agent (R1).

[Comparative Example 2]
A commercially available starch-based superabsorbent resin {manufactured by Sanyo Kasei Kogyo Co., Ltd., trade name: Sunfresh (registered trademark) ST-100, weight average particle diameter 370 μm} was used as a comparative liquid waste solidifying agent (R2).

[Comparative Example 3]
The absorbent resin (X1) prepared in the middle of Example 1 was used as the waste liquid solidifying agent (R3).

[Comparative Example 4]
In Example 1, instead of “Ryoto Sugar Ester S-1170 (manufactured by Mitsubishi Chemical Foods Co., Ltd., sucrose stearate ester, HLB = 11) 0.8 part”, “Riquemar PS-100 (RIKEN Vitamin ( The same procedure as in Example 1 was carried out except that 1.0 part by propylene glycol monostearate, HLB = 3.7) manufactured by the same company was obtained, to obtain a waste liquid solidifying agent (R4).

[Comparative Example 5]
Instead of “0.8 parts of Ryoto Sugar Ester S-1170 (manufactured by Mitsubishi Chemical Foods Co., Ltd., sucrose stearate, HLB = 11)” in Example 1, “Riquemar S-71-D (RIKEN) A waste liquid solidifying agent (R5) was obtained in the same manner as in Example 1 except that 0.05 part by stearate diglycerin ester manufactured by Vitamin Co., Ltd., HLB 5.4) was used.

[Comparative Example 6]
In Example 1, instead of “Ryoto Sugar Ester S-1170 (manufactured by Mitsubishi Chemical Foods, Inc., stearic acid sucrose ester, HLB = 11) 0.8 part”, “DK ester F-140 (first A waste liquid solidifying agent (R6) was obtained in the same manner as in Example 1 except that 0.8 part by sucrose fatty acid ester, HLB = 13) manufactured by Kogyo Seiyaku Co., Ltd. was used.

  Using the absorbents (1) to (12) obtained in Examples 1 to 12 and Comparative Examples 1 to 6 and comparative water retention agents (R1) to (R6), the following solidification test (solidification time, Solidified state). The results are shown in Table 1.

<Solidification test>
a) Solidification time Solidification time (1)
a-1) Solidification time for a 0.90% by weight sodium chloride aqueous solution containing 10% by weight of bovine blood containing an anticoagulant An anticoagulant containing bovine blood was collected immediately after collecting 4000 ml of bovine blood and 0.5M sodium ethylenediaminetetraacetate. 100 ml of an aqueous solution (pH = 8.0, manufactured by Wako Pure Chemical Industries, Ltd.) was added to prevent blood coagulation.
In a polyethylene container (upper inner diameter 1330 mm, lower inner diameter 1060 mm, height 3450 mm) placed with the axial direction vertical, sodium chloride 0.90% by weight and anticoagulant-containing bovine blood 10% by weight 3500 ml of a 0.90 wt% sodium chloride aqueous solution containing 10 wt% bovine blood containing an anticoagulant at 25 ° C. was added. An apparent density measuring funnel described in JIS K3362 is installed on the upper part of a polyethylene container so that the height of the lower mouth from the liquid level is 32 mm, and the lower mouth of the funnel is opened. After 115 g of the waste liquid solidifying agent was continuously charged therein, the time until the aqueous solution stopped moving even when the container was tilted was defined as the solidification time (1).

Solidification time (2)
a-2) Solidification time for 0.90% by weight sodium chloride aqueous solution containing 30% by weight of bovine blood containing anticoagulant The bovine blood containing anticoagulant was collected immediately after collecting 4000 ml of bovine blood and 0.5M sodium ethylenediaminetetraacetate. 100 ml of an aqueous solution (pH = 8.0, manufactured by Wako Pure Chemical Industries, Ltd.) was added to prevent blood coagulation.
In a polyethylene container (upper inner diameter 1330 mm, lower inner diameter 1060 mm, height 3450 mm) placed in the axial direction as vertical, sodium chloride 0.90% by weight and anticoagulant-containing bovine blood 30% by weight 3500 ml of an aqueous solution containing 30% by weight of bovine blood containing 0.90% by weight sodium chloride at 25 ° C. was added. An apparent density measuring funnel described in JIS K3362 is installed on the upper part of a polyethylene container so that the height of the lower mouth from the liquid level is 32 mm, and the lower mouth of the funnel is opened. After 115 g of the waste liquid solidifying agent was continuously charged therein, the time until the aqueous solution stopped moving even when the container was tilted was defined as the solidification time (2).

b) Solidified state Solidified state (1)
b-1) Solidification state with respect to 0.90% by weight sodium chloride aqueous solution containing 10% by weight bovine blood containing anticoagulant In the above solidification time (1), 0.90% by weight sodium chloride containing 10% by weight bovine blood containing anticoagulant After 1 hour had passed since the waste liquid solidifying agent was added to the aqueous solution, the container was laid on the floor, cut with a cutter knife in the middle of the container in the axial direction, and opened to both sides, and then the solidified state (1) was evaluated according to the following criteria.
◎: Cutter knife indentation is not broken at all and solid material is not deformed. ○: Cutter knife incision is not broken, solidified shape is not deformed, but is slightly deformed. △: Cutter knife incision is broken. , The solidified product is broken in shape ×: The aqueous solution cannot be solidified and is separated

Solidified state (2)
b-2) Solidification state for 0.90 wt% sodium chloride aqueous solution containing 30% by weight bovine blood containing anticoagulant In the above solidification time (2), 0.90% by weight sodium chloride containing 30% by weight bovine blood containing anticoagulant After 1 hour had passed since the waste liquid solidifying agent was added to the aqueous solution, the container was laid on the floor, cut in the middle of the container in the axial direction with a cutter knife, and double-opened, and then the solidified state (2) was evaluated according to the following criteria.
◎: Cutter knife indentation is not broken at all and solid material is not deformed. ○: Cutter knife incision is not broken, solidified shape is not deformed, but is slightly deformed. △: Cutter knife incision is broken. , The solidified product is broken in shape ×: The aqueous solution cannot be solidified and is separated

<Nure time>
Nure time (I)
After weighing 50 g of 0.90 wt% sodium chloride aqueous solution into a 100 ml glass beaker (inner diameter 50 mm, height 70 mm), the funnel for measuring the apparent density described in JIS-K3362 is taken from the liquid level of the lower mouth. The height was set to 50 mm. With the lower mouth of the funnel open, add 1.00 g of the waste liquid solidifying agent that is gently weighed to the medicine wrapping paper in the funnel, and wait until the waste liquid solidifying agent gets wet after the waste liquid solidifying agent is added. Measured to be (I).

Nure time (II)
After weighing 50 g of a 0.90 wt% sodium chloride aqueous solution containing 10 wt% of bovine blood containing an anticoagulant prepared in the above solidification test into a 100 ml glass beaker (inner diameter 50 mm, height 70 mm), JIS The apparent density measuring funnel described in -K3362 was installed so that the height from the liquid surface of the lower mouth was 50 mm. With the lower mouth of the funnel open, add 1.00 g of the waste liquid solidifying agent that is gently weighed to the medicine wrapping paper in the funnel, and wait until the waste liquid solidifying agent gets wet after the waste liquid solidifying agent is added. The measurement was made as the wet time (II).

Nure time (III)
After weighing 50 g of 0.90 wt% sodium chloride aqueous solution containing 30 wt% of bovine blood containing an anticoagulant prepared in the above solidification test into a 100 ml glass beaker (inner diameter 50 mm, height 70 mm), JIS The apparent density measuring funnel described in -K3362 was installed so that the height from the liquid surface of the lower mouth was 50 mm. With the lower mouth of the funnel open, add 1.00 g of the waste liquid solidifying agent that is gently weighed to the medicine wrapping paper in the funnel, and wait until the waste liquid solidifying agent gets wet after the waste liquid solidifying agent is added. It was measured and set as the wet time (III).

From the results in Table 1, when the waste liquid solidifying agent of Comparative Examples 1 to 3 that does not use a surfactant is used, it will sink to the bottom of the container in a short time after being charged, so that the waste liquid containing electrolyte (blood, etc.) It can be seen that it takes a long time to solidify and water separation occurs in the solidified state.
In addition, when the waste liquid solidifying agent of Comparative Example 4 using a surfactant having a strong hydrophobicity of 3.7 and HLB is used, the water absorption rate becomes slow when the concentration of the electrolyte (blood, etc.) increases to 30%. It can be seen that the waste liquid solidification property is lowered and the waste liquid is likely to ooze out.
In addition, when the waste liquid solidifying agent of Comparative Example 6 using a surfactant having an HLB of 13 and an excessively hydrophilic property is used, when the concentration of the electrolyte (blood, etc.) is reduced to about 10%, the container can be quickly used. Since it will sink to the bottom, it will be understood that it takes a long time to solidify the waste liquid containing the electrolyte (blood, etc.), and water separation occurs in the solidified state.
On the other hand, when the waste liquid solidifying agent of Examples 1 to 12 using a surfactant having an HLB of 5 to 12 is used, an aqueous solution having a bovine blood concentration of 10% by weight is 11 to 28 minutes, and an aqueous solution having a 30% by weight is 16%. It turns out that it can solidify in about 25 minutes. Furthermore, when the waste liquid solidifying agent of Examples 1 to 12 using a surfactant having an HLB of 5 to 12 was used, the solidified state was observed at different bovine blood concentrations (10 wt% and 30 wt%). Since it is favorable, it turns out that the influence by the density | concentration of electrolyte is small.

  The waste liquid solidifying agent according to the present invention is expected to have stable solidification performance regardless of the concentration of the electrolyte (blood, etc.) in the waste liquid, and even if the concentration of the electrolyte in the waste liquid becomes high, the waste liquid is difficult to bleed out, Since it is difficult to soften, it is used for beverages, factory wastes, radiation wastes, manure wastes, paint wastes, dental cleaning wastes, gastric camera cleaning wastes, various wastes such as sputum, especially wastes containing blood and body fluids. It can be used effectively for solidification.

Claims (6)

An absorbent resin (X) comprising a cross-linked polymer (A) having a water-soluble vinyl monomer (a1) and / or a hydrolyzable vinyl monomer (a2) which becomes water-soluble by hydrolysis as an essential constituent unit, and a nonionic interface; A method for producing a waste liquid solidifying agent mixed with an activator (Y) , wherein the content of (Y) is 0.2 to 4.5% by weight based on the weight of the water absorbent resin (X). , HLB (Y), is 5.4-12, (Y) is 25 ° C., the manufacturing method of the waste solution solidifying agent which is solid at 10 ³ hPa.   The method for producing a waste liquid solidifying agent according to claim 1, wherein the nonionic surfactant (Y) is at least one selected from the group consisting of sucrose fatty acid ester, sorbitan fatty acid ester, glycerin fatty acid ester and fatty acid amide. . Furthermore, the manufacturing method of the waste liquid solidification agent of Claim 1 or 2 including the following process (I).
Step (I): Step of crosslinking the surface of the crosslinked polymer (A) 4. The method for producing a waste liquid solidifying agent according to any one of claims 1 to 3, wherein a wet time (I) shown below is 20 to 90 seconds.
Nure time (I): 1.00 g of waste liquid solidifying agent is charged all at once into a beaker having an effective volume of 100 ml (inner diameter 50 mm) containing 50 g of 0.90 wt% sodium chloride aqueous solution at 25 ° C. Time to do. The manufacturing method of the packaging body for waste liquid solidification formed by filling the waste liquid solidification agent obtained by the manufacturing method in any one of Claims 1-4. A waste liquid treatment method for solidifying a waste liquid by introducing the waste liquid solidification agent into the waste liquid, wherein the waste liquid solidification agent is a waste liquid solidification agent obtained by the production method according to any one of claims 1 to 4. .