WO2023135675A1 - Agent de traitement aqueux destiné à traiter un article absorbant usagé ou non-usagé, et procédé de traitement d'article absorbant usagé ou non-usagé mettant en œuvre celui-ci - Google Patents

Agent de traitement aqueux destiné à traiter un article absorbant usagé ou non-usagé, et procédé de traitement d'article absorbant usagé ou non-usagé mettant en œuvre celui-ci Download PDF

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Publication number
WO2023135675A1
WO2023135675A1 PCT/JP2022/000670 JP2022000670W WO2023135675A1 WO 2023135675 A1 WO2023135675 A1 WO 2023135675A1 JP 2022000670 W JP2022000670 W JP 2022000670W WO 2023135675 A1 WO2023135675 A1 WO 2023135675A1
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WO
WIPO (PCT)
Prior art keywords
water
treatment agent
absorbent articles
absorbent article
treating
Prior art date
Application number
PCT/JP2022/000670
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English (en)
Japanese (ja)
Inventor
治 重枝
雅之 衣川
Original Assignee
共栄社化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 共栄社化学株式会社 filed Critical 共栄社化学株式会社
Priority to PCT/JP2022/000670 priority Critical patent/WO2023135675A1/fr
Priority to PCT/JP2023/000054 priority patent/WO2023136193A1/fr
Publication of WO2023135675A1 publication Critical patent/WO2023135675A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/34—Regenerating or reactivating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
    • C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the present invention relates to an aqueous treatment agent for treating used or unused absorbent articles and a method for treating used absorbent articles using the same.
  • Patent Document 1 A method for recovering constituent members of used absorbent articles has been proposed (Patent Document 1), which includes a separation step of separating the film and the absorbent agent material. Furthermore, Patent Document 1 describes that in the separation step, a step of inactivating the superabsorbent polymer with an inactivating agent such as an organic acid or a step of dissolving the hot-melt adhesive with a terpene may be provided. It is However, these methods cannot be said to be sufficiently efficient because the hot-melt adhesive is decomposed by physical impact before the process of dissolving it, and each process is separate.
  • Patent Document 3 a water-soluble paint remover containing benzyl alcohol, an alkaline component, a solubilizer, and the like is known as a remover used for removing paint.
  • a remover used for removing paint Patent Document 3
  • the use of such release agents for treating used absorbent articles as described above has not been known so far.
  • the present invention can easily disassemble each constituent member constituting the absorbent article, and the superabsorbent polymer can be inactivated. It is an object of the present invention to provide a water-based treatment agent capable of performing sterilization of used absorbent articles, and at the same time, capable of simplifying the process. Another object of the present invention is to provide a method for treating used absorbent articles, which can efficiently separate and recover used or unused absorbent articles for each constituent member. be.
  • the present invention contains a polar solvent (A) with an SP value of 10 to 13, an inorganic alkali compound (B), an alkali metal inorganic salt or an alkaline earth metal inorganic salt (C), and a solubilizer (D). , is a water-based treatment agent for treating used absorbent articles.
  • the polar solvent (A) is preferably at least one selected from the group consisting of benzyl alcohol, phenethyl alcohol, phenoxyethanol, N-methyl-2-pyrrolidone and diethylene glycol monobutyl ether.
  • the inorganic alkaline compound (B) is preferably sodium hydroxide and/or potassium hydroxide.
  • the alkali metal inorganic salt or alkaline earth metal inorganic salt (C) is preferably at least one selected from the group consisting of sodium sulfate, sodium chloride, potassium chloride, magnesium chloride, magnesium sulfate, and potassium sulfate.
  • the solubilizer (D) is preferably at least one selected from the group consisting of toluenesulfonates, xylenesulfonates and glycol solvents.
  • the present invention is a method for treating used absorbent articles comprising at least an absorbent body containing pulp and a superabsorbent polymer, a nonwoven fabric, and a film as constituent members, A polar solvent (A) having an SP value of 9 to 13, an inorganic alkali compound (B), an alkali metal inorganic salt or an alkaline earth metal inorganic salt (C), and a solubilizer (Ste (1) of applying an aqueous treatment agent containing D) to decompose the used absorbent article into each of the constituent members and inactivate the superabsorbent polymer; Step (2) of separating and recovering each constituent member disassembled in step (1) It is also a method of treating used absorbent articles having
  • the water-based treatment agent for treating used or unused absorbent articles of the present invention can easily decompose the absorbent articles into individual constituent members, and at the same time inactivate the superabsorbent polymer. can be performed, thus allowing simplification of the process. At the same time, sterilization of absorbent articles can also be expected.
  • the absorbent article can be efficiently separated and collected for each constituent member.
  • FIG. 10 is an explanatory diagram showing the state and mass of absorbers (pulp and superabsorbent polymer (SAP)) of Examples 10 to 12 after a SAP inactivation test.
  • FIG. 10 is an explanatory diagram showing the state and mass of absorbers (pulp and superabsorbent polymer (SAP)) of Examples 13 to 16 after a SAP inactivation test.
  • FIG. 10 is an explanatory diagram showing the appearance and mass of absorbers (pulp and superabsorbent polymer (SAP)) of Comparative Examples 11 to 14 after an SAP inactivation test.
  • FIG. 10 is an explanatory diagram showing the state and mass of absorbers (pulp and superabsorbent polymer (SAP)) of Comparative Examples 15 to 17 after the SAP inactivation test.
  • FIG. 10 is an explanatory diagram showing the state and mass of absorbers (pulp and superabsorbent polymer (SAP)) of Comparative Examples 18 to 20 after a SAP inactivation test.
  • the water-based treatment agent of the present invention comprises a polar solvent (A) having an SP value of 10 to 13, an inorganic alkali compound (B), an alkali metal inorganic salt or an alkaline earth metal inorganic salt (C), and a solubilizer ( D), and is used in the process of separating and recovering used or unused absorbent articles by constituent members when reusing (recycling) used absorbent articles.
  • A polar solvent having an SP value of 10 to 13
  • B inorganic alkali compound
  • C alkali metal inorganic salt or an alkaline earth metal inorganic salt
  • D solubilizer
  • Absorbent articles handled in the present invention include, for example, paper diapers, incontinence pads, sanitary napkins, bed sheets, pet sheets and the like.
  • a used absorbent article is an absorbent article that has been used by a user, and is usually an absorbent article that has absorbed the liquid excretion of the user.
  • used absorbent articles include those that have been used but have not absorbed excrement.
  • unused absorbent articles include those that have become defective in the factory manufacturing process.
  • the absorbent article include an absorbent body containing pulp and a superabsorbent polymer, a nonwoven fabric, and a film as at least structural members.
  • the absorbent article may include an adhesive tape, a rubber thread, or the like as other constituent members.
  • Examples of the pulp contained in the absorber include cellulose fibers.
  • Cellulosic fibers include, for example, wood pulp, crosslinked pulp, non-wood pulp, regenerated cellulose, semi-synthetic cellulose, and the like.
  • Examples of the super absorbent polymer (SAP) contained in the absorber include water absorbing polymers such as polyacrylate, polysulfonate, and maleate anhydride. The superabsorbent polymer is usually particulate and dispersed in the pulp.
  • nonwoven fabric and film examples include olefin resins such as polyethylene and polypropylene, polyamide resins such as 6-nylon and 6,6-nylon, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and the like. and polyester resins.
  • olefin resins such as polyethylene and polypropylene
  • polyamide resins such as 6-nylon and 6,6-nylon
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • polyester resins polyester resins.
  • the above nonwoven fabric and film are liquid permeable nonwoven fabric, synthetic resin film having liquid permeable pores, composite sheets thereof, liquid impermeable nonwoven fabric, liquid impermeable synthetic resin film, these nonwoven fabrics. and a composite sheet or the like of a synthetic resin film is used.
  • a configuration example of the absorbent article includes, for example, one including a topsheet, a backsheet, and an absorbent body disposed between the topsheet and the backsheet.
  • the nonwoven fabric or film or the like is used for the top sheet and the back sheet.
  • one surface and the other surface of the absorbent body are respectively joined to the top sheet and the back sheet via an adhesive.
  • the portion (peripheral portion) of the topsheet that extends outside the absorber so as to surround the absorber is the portion of the backsheet that extends outside the absorber so as to surround the absorber. It is joined to the extended portion (peripheral portion) via an adhesive. Therefore, the absorbent body is wrapped inside the joined body of the top sheet and the back sheet.
  • Hot-melt adhesives include, for example, rubber-based adhesives such as styrene-ethylene-butadiene-styrene, styrene-butadiene-styrene, and styrene-isoprene-styrene, or olefin-based pressure-sensitive or heat-sensitive adhesives such as polyethylene. Examples include adhesives and the like.
  • a polar solvent (A) having a specific SP value, an inorganic alkali compound (B), an alkali metal inorganic salt or an alkaline earth metal inorganic salt (C), and a solubilizer (D) are combined to perform aqueous treatment.
  • the water-based treatment agent of the present invention is preferably a treatment agent in which various components are homogenized. Uniformity is preferable in that the penetration into the absorbent article is improved and the adhesive, particularly the hot-melt adhesive, in the absorbent article can be sufficiently dissolved.
  • the adhesive is dissolved, the constituent members joined with the adhesive are separated from each other, and the constituent members such as the water absorber, the nonwoven fabric, and the film are decomposed. In this way, by dissolving the adhesive and decomposing each constituent member, it is possible to recycle the nonwoven fabric, the film, and the like.
  • the aqueous treatment agent of the present invention also has the effect of inactivating the superabsorbent polymer in the absorbent body.
  • the action mechanism of the water-based treatment agent of the present invention for inactivating the superabsorbent polymer is not clear, it is presumed as follows.
  • the water-based treatment agent of the present invention Since the water-based treatment agent of the present invention has an affinity for water, it is incorporated into the superabsorbent polymer.
  • the water-based treatment agent incorporated into the superabsorbent polymer dissolves the water in the superabsorbent polymer. After dissolving a certain amount of water, the water-based treatment agent in the water-dissolved superabsorbent polymer becomes saturated and no longer dissolves water.
  • the polar solvent separates from water and is discharged from the superabsorbent polymer with a certain amount of water dissolved therein. As a result, the inorganic alkali metal salt and/or the inorganic alkaline earth metal salt remain in the superabsorbent polymer at a high concentration.
  • alkali metal ions or alkaline earth metal ions are present at a high concentration around the superabsorbent polymer. This creates an osmotic pressure between the solution and the superabsorbent polymer, causing dehydration. It is believed that such action causes efficient dehydration.
  • the aqueous treatment agent of the present invention causes dehydration of the superabsorbent polymer by the above action, so that a separate process for deactivating the superabsorbent polymer is not required, the process can be simplified, and the process can be simplified. This is preferable in that recovery is facilitated by volumetric compression from the time of water absorption due to deactivation.
  • the polar solvent (A) should have an SP value of 10-13.
  • the SP value (solubility parameter ( ⁇ )) is a value defined by the regular solution theory introduced by Hildebrand, and is the square root of the heat of vaporization required to evaporate 1 cm 3 of liquid (cal/cm 3 ) 1 /2 .
  • the use of a polar solvent having an SP value within this range is preferable in terms of removal of the adhesive and deactivation of the superabsorbent polymer.
  • the SP value of the polar solvent used in the present invention is preferably 11 or more. On the other hand, the SP value is preferably 12.5 or less.
  • polar solvent (A) having the above SP value examples include benzyl alcohol (SP value: 12.1), phenethyl alcohol (SP value: 11.2), phenoxyethanol (SP value: 12.4), N -Methyl-2-pyrrolidone (NMP) (SP value: 11.2), diethylene glycol monobutyl ether (SP value: 10.2), isopropanol (SP value: 11.5), dimethylformamide (DMF) (SP value: 11 .9), dimethyl sulfoxide ((DMSO) SP value: 12.0), and the like. These may be used alone or in combination of two or more.
  • benzyl alcohol, phenoxyethanol, and phenethyl alcohol are preferable from the viewpoint of removing the adhesive and inactivating the superabsorbent polymer. Further, if phenoxyethanol, which has a bactericidal effect, is used, a more bactericidal effect can be expected.
  • Examples of the inorganic alkali compound (B) include sodium hydroxide, potassium hydroxide, sodium phosphate, potassium phosphate, sodium silicate, potassium silicate and the like, and at least one selected from these is used. Among them, sodium hydroxide and potassium hydroxide are preferred from the standpoint of strong alkalinity.
  • alkali metal inorganic salt or alkaline earth metal inorganic salt (C) examples include sodium sulfate, sodium chloride, potassium chloride, magnesium chloride, magnesium sulfate, potassium sulfate, and the like, and at least one salt selected from these is used. Among them, sodium sulfate and magnesium sulfate are preferable from the viewpoint of deactivation efficiency of the superabsorbent polymer.
  • the solubilizer (D) used in the present invention is a component capable of uniformly mixing the polar solvent (A) and the like, and examples thereof include aromatic sulfonates and alkanolamines.
  • each component and water can be uniformly mixed.
  • the solubilizer (D) is preferably an aromatic sulfonate, specifically selected from the group consisting of toluenesulfonate, xylenesulfonate, cumenesulfonate, and methoxybenzenesulfonate. is preferably at least one.
  • toluenesulfonates, xylenesulfonates, cumenesulfonates and methoxybenzenesulfonates include salts of sodium, potassium, lithium and calcium, among which sodium salts are preferred.
  • sodium p-toluenesulfonate, sodium xylenesulfonate, sodium cumenesulfonate, and sodium methoxybenzenesulfonate not only uniformly mixes the polar solvent, etc., but also promotes deactivation of the superabsorbent polymer. It is preferable in that it can
  • the content of the polar solvent (A) in the water-based treatment agent is preferably 20 to 90% by mass.
  • the lower limit of the content is more preferably 30% by mass, still more preferably 35% by mass, and most preferably 40% by mass.
  • the upper limit of the content is more preferably 60% by mass, still more preferably 50% by mass. If the polar solvent is too small, the ability to remove the adhesive tends to decrease. Solids such as salt (C) tend to precipitate.
  • the inorganic alkaline compound (B) is preferably contained in an amount of 1 to 10% by mass in the water-based treatment agent.
  • the content is more preferably 1 to 5% by mass, still more preferably 2 to 4.5% by mass. If the amount of the inorganic alkaline compound is too small, the ability to remove the adhesive may be lowered.
  • the alkali metal inorganic salt or alkaline earth metal inorganic salt (C) is preferably contained in an aqueous treatment agent in an amount of 0.5 to 5% by mass.
  • the lower limit of the content is more preferably 1% by mass.
  • the upper limit of the content is more preferably 3% by mass, still more preferably 2% by mass. If the alkali metal inorganic salt or alkaline earth metal inorganic salt is too small, the deactivation efficiency of the superabsorbent polymer tends to decrease. Solids such as salt (C) tend to precipitate.
  • the solubilizer (D) is preferably contained in an amount of 5 to 30% by mass in the water-based treatment agent.
  • the lower limit of the content is more preferably 12% by mass, still more preferably 15% by mass.
  • the upper limit of the content is more preferably 25% by mass, still more preferably 20% by mass. If the solubilizer is too small, the polar solvent tends not to be solubilized. There is a tendency for precipitation of salt (C) and the like to occur.
  • the water-based treatment agent of the present invention preferably contains 10 to 50% by mass of water at the time of use.
  • a water-free treatment agent may be prepared and diluted with a predetermined amount of water just before use.
  • the present invention also includes a water-free water-based treatment agent.
  • the pH of the water-based treatment agent of the present invention is preferably 13.0 or higher. If the pH is less than 13.0, the ability to remove the adhesive tends to decrease. If the water-based treatment agent of the present invention is alkaline, it can be expected to have a bactericidal action.
  • the aqueous treatment agent of the present invention preferably contains a chelating agent. Containing a chelating agent works advantageously in preventing adhesion of water-derived metal scale such as calcium to treatment equipment.
  • an aminocarboxylic acid-based chelating agent is preferable, and specifically, nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), hydroxyethylenediaminetriacetic acid (HEDTA), ethylenediamine. -N,N-disuccinic acid (EDDS) and the like.
  • NTA is preferable in terms of chelating power.
  • the chelating agent may be used alone or in combination of two or more. Also, the content of the chelating agent is preferably 0.1 to 1.0% by mass in the water-based treatment agent.
  • nonionic surfactants may be added to the aqueous detergent of the present invention.
  • anionic surfactants may be added to the aqueous detergent of the present invention.
  • amphoteric surfactants may be added to the aqueous detergent of the present invention.
  • the water-based treatment agent of the present invention may be prepared, for example, by mixing each of the above-mentioned raw materials and, if necessary, water by a conventional method such as stirring.
  • the method for treating used or unused absorbent articles of the present invention treats used or unused absorbent articles comprising at least an absorbent body containing pulp and a superabsorbent polymer, a nonwoven fabric, and a film as constituent members.
  • a method for Aqueous treatment containing a polar solvent (A) having an SP value of 10 to 13, an inorganic alkali compound (B), an alkali metal salt or an alkaline earth metal salt (C), and a solubilizer in the absorbent article.
  • the water-based treatment agent is applied to the absorbent article.
  • the method is not particularly limited, and may be performed as appropriate.
  • the absorbent article is immersed in the water-based treatment agent by placing the absorbent article in a container, tank, or the like containing the water-based treatment agent.
  • the immersion temperature is preferably 70 to 80°C. Within this temperature range, the adhesive can be removed without problems.
  • the immersion time is preferably 30 to 60 minutes.
  • the mixture may be stirred by rotating a propeller or the like.
  • the water-based treatment agent dissolves the adhesive that joins the constituent members together, and decomposes them into constituent members such as absorbents, nonwoven fabrics, and films.
  • the adhesive at the joint between the nonwoven fabric or film and other constituent members film, nonwoven fabric, absorber, etc.
  • the nonwoven fabric or film and other constituent members are not broken. It can be decomposed into each while maintaining the shape as it is without equalizing. Therefore, constituent members such as nonwoven fabrics and films of absorbent articles can be efficiently recovered.
  • the non-woven fabric or film can be reused as a highly pure resin, and the adhesive will not adversely affect the reuse of the non-woven fabric or film. can be suppressed.
  • the superabsorbent polymer is dehydrated by inactivation. Dehydration of the superabsorbent polymer greatly reduces the mass of the absorber, making separation and recovery easier. Moreover, since the superabsorbent polymer becomes less viscous by dehydration, the superabsorbent polymer adhering to the nonwoven fabric or film can be easily separated from them.
  • each disassembled component is separated and collected.
  • the separation method is not particularly limited.
  • the constituent members are separated and recovered from the mixed liquid obtained in step (1) by utilizing the difference in buoyancy of the constituent members or by filtering using a nonwoven fabric, a sieve, or the like.
  • the pulp and the superabsorbent polymer are not separated, but separated and recovered as an integrated absorbent.
  • washing with water may be performed before or during the separation, or after recovery.
  • the recovered nonwoven fabric, film, etc. may be dehydrated and dried by heating, that is, dried in an atmosphere at a temperature higher than room temperature or in hot air, if necessary.
  • step (2) neutralization may be performed using water containing organic acids such as citric acid, malic acid, succinic acid, and fumaric acid.
  • organic acids such as citric acid, malic acid, succinic acid, and fumaric acid.
  • a step of washing the used or unused absorbent article with water containing a detergent or the like may be provided in advance, or the method may also serve as the washing step. There may be.
  • the nonwoven fabrics and films recovered as described above are suitable for recycling because they do not have an adhesive attached thereto.
  • the pulp and the superabsorbent polymer in the recovered absorbent body may be appropriately separated and recovered by a known method.
  • the recovered pulp and superabsorbent polymer can each be reused.
  • used or unused absorbent articles can be processed in a single step without degrading the absorbent article by physical impact prior to the step of dissolving the hot-melt adhesive. can be disassembled for each constituent member, efficient separation and collection of the constituent members is possible.
  • water-based treatment agent of the present invention can be recovered after use in the treatment method described above, subjected to treatment such as concentration as necessary, and reused multiple times.
  • Example 1 50% diethylene glycol monobutyl ether, 15% sodium p-toluenesulfonate, 4.3% sodium hydroxide, 0.35% NTA, 1% sodium sulfate and 33% water were mixed to prepare an aqueous treatment agent.
  • evaluation was made by the following hot-melt adhesive removal test and superabsorbent polymer deactivation test.
  • solubilization state of the resulting water-based treatment agent was also evaluated. Moreover, the results are shown in Table 1.
  • ⁇ Hot melt adhesive removal test> A commercially available paper diaper (Merries (registered trademark) manufactured by Kao Corporation) was cut into 5 cm ⁇ 5 cm pieces and immersed in 50 g of a water-based treatment agent at a temperature of 80° C. for 30 minutes, followed by the following evaluations.
  • ⁇ The constituent members of the paper diaper were disassembled, but there was much stickiness on the surfaces of the constituent members.
  • x The constituent members of the disposable diaper were not disassembled.
  • the mass of SAP + pulp after filtration is 25 g or less ⁇ : The mass of SAP + pulp after filtration is 26 to 30 g ⁇ : The mass of SAP + pulp after filtration is 31 to 35 g ⁇ : The mass of SAP + pulp after filtration is 36 g or more
  • Example 2 Each test was conducted in the same manner as in Example 1, except that the composition of the water-based treatment agent was as shown in Table 1. The results are shown in Table 1.
  • Example 10-16 A water-based treatment agent was prepared in the same manner as in Example 1, except that the alkali metal salts and alkaline earth metal salts shown in Table 3 were used, and an inactivation test of SAP was performed by the following method. The results are shown in FIGS. 1 and 2.
  • FIG. 1 A water-based treatment agent was prepared in the same manner as in Example 1, except that the alkali metal salts and alkaline earth metal salts shown in Table 3 were used, and an inactivation test of SAP was performed by the following method. The results are shown in FIGS. 1 and 2.
  • the present invention is suitable for separating and collecting used or unused absorbent articles such as disposable diapers.

Abstract

L'invention fournit un agent de traitement aqueux qui permet de décomposer facilement chaque élément constitutif configurant un article absorbant lors de la séparation et de la récupération d'articles absorbants, tels que des couches jetables, ou similaire, usagés ou non-usagés, et permet simultanément d'inactiver des polymères hautement absorbants et de désinfecter l'article absorbant, et qui permet de simplifier le processus. Plus précisément, l'invention concerne un agent de traitement aqueux destiné à traiter un article absorbant usagé ou non-usagé qui comprend un solvant polaire (A) de valeur de paramètre de solubilité comprise entre １０ et １３, un composé alcalin inorganique (B), un sel inorganique de métal alcalin ou un sel inorganique de métal alcalino-terreux (C) et un agent solubilisant (D).
PCT/JP2022/000670 2022-01-12 2022-01-12 Agent de traitement aqueux destiné à traiter un article absorbant usagé ou non-usagé, et procédé de traitement d'article absorbant usagé ou non-usagé mettant en œuvre celui-ci WO2023135675A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2022/000670 WO2023135675A1 (fr) 2022-01-12 2022-01-12 Agent de traitement aqueux destiné à traiter un article absorbant usagé ou non-usagé, et procédé de traitement d'article absorbant usagé ou non-usagé mettant en œuvre celui-ci
PCT/JP2023/000054 WO2023136193A1 (fr) 2022-01-12 2023-01-05 Agent de traitement aqueux destiné à traiter un article absorbant usagé ou non-usagé, et procédé de traitement d'article absorbant usagé ou non-usagé mettant en œuvre celui-ci

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PCT/JP2022/000670 WO2023135675A1 (fr) 2022-01-12 2022-01-12 Agent de traitement aqueux destiné à traiter un article absorbant usagé ou non-usagé, et procédé de traitement d'article absorbant usagé ou non-usagé mettant en œuvre celui-ci

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PCT/JP2023/000054 WO2023136193A1 (fr) 2022-01-12 2023-01-05 Agent de traitement aqueux destiné à traiter un article absorbant usagé ou non-usagé, et procédé de traitement d'article absorbant usagé ou non-usagé mettant en œuvre celui-ci

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Citations (5)

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