WO2024172530A1 - 고흡수성 수지 및 이의 제조 방법 - Google Patents
고흡수성 수지 및 이의 제조 방법 Download PDFInfo
- Publication number
- WO2024172530A1 WO2024172530A1 PCT/KR2024/095142 KR2024095142W WO2024172530A1 WO 2024172530 A1 WO2024172530 A1 WO 2024172530A1 KR 2024095142 W KR2024095142 W KR 2024095142W WO 2024172530 A1 WO2024172530 A1 WO 2024172530A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- resin
- weight
- base resin
- group
- Prior art date
- Legal status (The legal status 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 status listed.)
- Ceased
Links
Classifications
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/245—Differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3442—Heterocyclic compounds having nitrogen in the ring having two nitrogen atoms in the ring
- C08K5/3445—Five-membered rings
-
- 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
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
Definitions
- the present invention relates to a superabsorbent resin and a method for producing the same. Specifically, the present invention relates to a superabsorbent resin and a method for producing the same, which can effectively suppress odors generated from urine, etc. when applied to products such as diapers by improving deodorizing ability without deteriorating the inherent physical properties of the superabsorbent resin by using a specific deodorizing agent.
- Super absorbent polymer is a synthetic polymer material that can absorb 500 to 1,000 times its own weight in moisture. Different developers call it by different names, such as SAM (Super Absorbency Material) and AGM (Absorbent Gel Material).
- SAM Super Absorbency Material
- AGM Absorbent Gel Material
- these superabsorbent resins are widely used in the field of sanitary materials such as diapers and sanitary napkins.
- the superabsorbent resin is generally included in a state of being dispersed in pulp.
- efforts have been made to provide sanitary materials such as diapers with thinner thickness, and as part of this, the development of so-called pulpless diapers in which the pulp content is reduced or even no pulp is used at all is being actively promoted.
- superabsorbent polymers can be used in sanitary materials such as diapers and sanitary pads, but in this case, there may be a problem of reduced usability due to the foul odor of the absorbed liquid, such as human and pet excrement.
- the present invention relates to a superabsorbent resin and a method for manufacturing the same, which can effectively suppress odors generated from urine and the like when applied to products such as diapers by improving deodorizing performance without deteriorating the inherent physical properties of the superabsorbent resin by using a specific deodorizing agent.
- one embodiment of the present invention is,
- a step (step 1) of forming a functional gel polymer by performing polymerization on a monomer composition comprising an acrylic acid-based monomer containing an acidic group and at least a portion of the acidic group being neutralized, an internal cross-linking agent, and a polymerization initiator;
- step 2 A step of drying, crushing and classifying the above functional gel polymer to form a base resin (step 2);
- Step 3 Step of mixing the base resin and deodorant (step 3);
- step 4 of performing a surface cross-linking reaction on a mixture of the base resin and the deodorant in the presence of a surface cross-linking solution containing a surface cross-linking agent
- the above deodorant comprises a metal organic framework (MOF) or an ion exchange resin.
- a method for manufacturing a superabsorbent resin is provided.
- a base resin complex comprising an acrylic acid monomer containing an acid group, wherein at least a portion of the acid group is neutralized, and a base resin polymerized with an internal crosslinking agent, and wherein at least a portion of a deodorizing agent is supported on the polymer chain of the base resin;
- the above deodorant comprises a metal organic framework (MOF) or an ion exchange resin.
- the present invention improves deodorizing performance without lowering the inherent properties of superabsorbent resins by using MOF (metal organic framework) or ion exchange resins as deodorizing agents, thereby effectively suppressing odors generated from urine, etc. when applied to products such as diapers.
- MOF metal organic framework
- ion exchange resins as deodorizing agents
- first, second, tertiary, etc. are used to describe various components and are used only to distinguish one component from another.
- polymer or “polymer” used herein means a polymerized state of an acrylic acid-based monomer, and may encompass all moisture content ranges or particle size ranges.
- a polymer having a moisture content (moisture content) of about 40 wt% or more before drying after polymerization may be referred to as a hydrogel polymer, and particles of such a hydrogel polymer that are pulverized and dried may be referred to as a crosslinked polymer.
- base resin or “base resin powder” means a polymer made into a particle or powder form by drying and pulverizing a polymer in which an acrylic acid-based monomer is polymerized, and which has not undergone the surface modification or surface cross-linking step described below.
- the term "superabsorbent resin” or “superabsorbent resin powder” is used to mean, depending on the context, a base resin in the form of a powder made of a crosslinked polymer in which a water-soluble ethylenically unsaturated monomer (acrylic acid-based monomer) containing an acidic group and in which at least a portion of the acidic group is neutralized is polymerized, or superabsorbent resin particles obtained by pulverizing the crosslinked polymer, or all of which are made into a state suitable for productization through an additional process, such as surface crosslinking, fine powder reassembly, drying, pulverization, classification, etc., of the crosslinked polymer or the base resin.
- a base resin in the form of a powder made of a crosslinked polymer in which a water-soluble ethylenically unsaturated monomer (acrylic acid-based monomer) containing an acidic group and in which at least a portion of the acidic group is neutralized is
- a step (step 1) of forming a functional gel polymer by performing polymerization on a monomer composition comprising an acrylic acid-based monomer containing an acidic group and at least a portion of the acidic group being neutralized, an internal cross-linking agent, and a polymerization initiator;
- step 2 A step of drying, crushing and classifying the above functional gel polymer to form a base resin (step 2);
- Step 3 Step of mixing the base resin and deodorant (step 3);
- step 4 of performing a surface cross-linking reaction on a mixture of the base resin and the deodorant in the presence of a surface cross-linking solution containing a surface cross-linking agent
- the above deodorant includes a metal organic framework (MOF) or an ion exchange resin.
- MOF metal organic framework
- ion exchange resin an ion exchange resin
- Superabsorbent polymers are used in a variety of sanitary products such as diapers and sanitary pads, but when used, the feeling of use may be reduced due to the foul odor of excrement discharged from people and pets. In addition, as the time of wearing passes, there is also the problem of additional foul odors being generated due to the accelerated growth of bacteria caused by the liquid absorbed in the product.
- the inventors of the present invention have discovered that by using a metal organic framework (MOF) or an ion exchange resin as a deodorant and mixing it with a base resin prior to surface crosslinking rather than simply mixing it with the final superabsorbent resin and then performing surface crosslinking, it is possible to effectively control odors caused by various causes while maintaining a white color without lowering the basic properties of superabsorbent resins, such as water retention capacity and absorbency under pressure, and absorption speed, and thus complete the present invention.
- MOF metal organic framework
- ion exchange resin an ion exchange resin
- the above step 1 is a step for producing a functional gel polymer, and specifically, is a step for performing polymerization on a monomer composition including an acrylic acid-based monomer containing an acidic group and at least a portion of the acidic group being neutralized, an internal cross-linking agent, and a polymerization initiator to form a functional gel polymer.
- the above acrylic acid monomer may be any monomer commonly used in the production of superabsorbent resins.
- the acrylic acid monomer may be a compound represented by the following chemical formula 1:
- R 1 is an alkyl group having 2 to 5 carbon atoms containing an unsaturated bond
- M 1 is a hydrogen atom, a monovalent or divalent metal, an ammonium group, or an organic amine salt.
- the acrylic acid-based monomer includes at least one selected from the group consisting of acrylic acid, methacrylic acid, and monovalent metal salts, divalent metal salts, ammonium salts, and organic amine salts thereof.
- the above acrylic acid monomer has an acidic group, and at least a portion of the acidic group may be neutralized.
- the monomer partially neutralized with an alkaline substance such as sodium hydroxide, potassium hydroxide, or ammonium hydroxide may be used.
- the neutralization degree of the monomer may be 40 to 95 mol%, or 40 to 80 mol%, or 45 to 75 mol%.
- the range of the neutralization degree may vary depending on the final properties, but if the neutralization degree is too high, the neutralized monomer may precipitate, making it difficult for polymerization to proceed smoothly, and on the contrary, if the neutralization degree is too low, not only will the absorbency of the polymer be greatly reduced, but it may also exhibit properties like elastic rubber that are difficult to handle.
- the above “internal cross-linking agent” is a term used to distinguish it from a "surface cross-linking agent” for cross-linking the surface of the base resin, and plays a role in cross-linking and polymerizing the unsaturated bonds of the acrylic monomers described above.
- the cross-linking in the above step is performed without distinction between the surface and the interior, but through the surface cross-linking process of the base resin described below, the particle surface of the finally manufactured superabsorbent resin is formed into a structure cross-linked by the surface cross-linking agent, and the interior is formed into a structure cross-linked by the internal cross-linking agent.
- any compound that enables the introduction of crosslinking bonds during polymerization of the acrylic acid monomer may be used as the internal crosslinking agent.
- Non-limiting examples thereof include internal cross-linkers selected from the group consisting of N,N'-methylenebisacrylamide, trimethylolpropane tri(meth)acrylate, ethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, butanediol di(meth)acrylate, butylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, hexanediol di(meth)acrylate, triethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, dipentaerythritol pentaacrylate, glycerin tri(meth)acryl
- Such internal cross-linking agent may be added at a concentration of 0.001 to 1 wt%, or 0.01 to 0.8 wt%, or 0.1 to 0.7 wt% with respect to the monomer composition. That is, if the concentration of the internal cross-linking agent is too low, the absorption rate of the resin may be lowered and the gel strength may be weakened, which is not preferable. Conversely, if the concentration of the internal cross-linking agent is too high, the absorption capacity of the resin may be lowered, which is not preferable as an absorbent.
- the monomer composition may further contain additives such as a thickener, a plasticizer, a preservation stabilizer, and an antioxidant as needed.
- additives such as a thickener, a plasticizer, a preservation stabilizer, and an antioxidant as needed.
- the monomer composition may contain a polymerization initiator commonly used in the production of superabsorbent resins.
- a thermal polymerization initiator or a photopolymerization initiator may be used depending on the polymerization method.
- a certain amount of heat is generated by ultraviolet irradiation, etc., and a certain amount of heat is generated as the polymerization reaction, which is an exothermic reaction, progresses, so a thermal polymerization initiator may be additionally included.
- photopolymerization initiator for example, one or more compounds selected from the group consisting of benzoin ether, dialkyl acetophenone, hydroxyl alkylketone, phenyl glyoxylate, benzyl dimethyl ketal, acyl phosphine, and a-aminoketone can be used.
- acyl phosphine commercially available lucirin TPO, i.e., 2,4,6-trimethyl-benzoyl-trimethyl phosphine oxide, can be used.
- lucirin TPO i.e., 2,4,6-trimethyl-benzoyl-trimethyl phosphine oxide
- thermal polymerization initiator one or more compounds selected from the group consisting of a persulfate initiator, an azo initiator, hydrogen peroxide, and ascorbic acid can be used.
- a persulfate initiator examples include sodium persulfate (Na 2 S 2 O 8 ), potassium persulfate (K 2 S 2 O 8 ), and ammonium persulfate ((NH 4 ) 2 S 2 O 8 ).
- azo initiators 2,2-azobis(2-amidinopropane) dihydrochloride, 2,2-azobis-(N,N-dimethylene)isobutyramidine dihydrochloride, 2-(carbamoylazo)isobutylonitril, 2,2-azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride, and 4,4-azobis-(4-cyanovaleric acid) Examples include 4,4-azobis-(4-cyanovaleric acid)).
- thermal polymerization initiators refer to page 203 of Odian's book, "Principle of Polymerization (Wiley, 1981)".
- Such polymerization initiator may be added at a concentration of 0.001 to 1 wt%, or 0.005 to 0.1 wt%, relative to the monomer composition. That is, if the concentration of the polymerization initiator is too low, the polymerization rate may be slowed down and a large amount of residual monomer may be extracted from the final product, which is not preferable. On the other hand, if the concentration of the polymerization initiator is too high, the polymer chains forming the network may become shorter, which may increase the content of water-soluble components and lower the pressure absorbency, thereby deteriorating the properties of the resin, which is not preferable.
- these monomer compositions can be prepared in the form of a solution in which raw materials such as the aforementioned acrylic acid monomer, polymerization initiator, internal crosslinking agent, and foaming agent are dissolved in a solvent.
- any solvent that can dissolve the above-mentioned raw materials can be used without limitation in its composition.
- the solvent may be water, ethanol, ethylene glycol, diethylene glycol, triethylene glycol, 1,4-butanediol, propylene glycol, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, methyl ethyl ketone, acetone, methyl amyl ketone, cyclohexanone, cyclopentanone, diethylene glycol monomethyl ether, diethylene glycol ethyl ether, toluene, xylene, butyrolactone, carbitol, methyl cellosolve acetate, N,N-dimethylacetamide, or mixtures thereof.
- the formation of a functional gel polymer through polymerization of the above monomer composition can be performed by a conventional polymerization method, and the process is not particularly limited.
- the polymerization method is largely divided into thermal polymerization and photopolymerization depending on the type of polymerization energy source.
- thermal polymerization it can be carried out in a reactor having a stirring shaft such as a kneader, and in the case of photopolymerization, it can be carried out in a reactor equipped with a movable conveyor belt.
- the monomer composition may be introduced into a reactor, such as a kneader, equipped with a stirring shaft, and hot air may be supplied thereto or the reactor may be heated to thermally polymerize, thereby obtaining a hydrogel polymer.
- a reactor such as a kneader
- hot air may be supplied thereto or the reactor may be heated to thermally polymerize, thereby obtaining a hydrogel polymer.
- the hydrogel polymer discharged through the reactor outlet may be obtained as particles of several millimeters to several centimeters.
- the obtained hydrogel polymer may be obtained in various shapes depending on the concentration of the injected monomer composition, the injection speed, etc., and typically, a hydrogel polymer having a (weight average) particle diameter of 2 to 50 mm may be obtained.
- the thickness of the sheet can vary depending on the concentration and injection speed of the injected monomer composition, and in order to ensure that the entire sheet can be polymerized evenly while also securing the production speed, etc., it is usually preferable to adjust the thickness to 0.5 to 10 cm.
- the functional gel polymer formed in this way can exhibit a moisture content of 40 to 80 wt%.
- the moisture content refers to the weight of moisture in the total weight of the functional gel polymer, and can be a value obtained by subtracting the weight of the polymer in a dry state from the weight of the functional gel polymer. Specifically, it can be defined as a value calculated by measuring the weight loss due to evaporation of moisture in the polymer in the process of drying the polymer by raising the temperature of the polymer through infrared heating. At this time, the drying condition is set to a method of raising the temperature from room temperature to about 180°C and then maintaining it at 180°C, and the total drying time can be set to 20 minutes, including 5 minutes of the temperature raising step.
- Step 2 of the present invention is a step of forming a base resin powder by drying, pulverizing, and classifying the functional gel polymer manufactured in step 1.
- the step of coarsely pulverizing the above-mentioned functional gel polymer before drying may be further included.
- the term 'coarse pulverization' is conveniently used in this specification for pulverization before drying.
- the crusher used for the above crushing is not limited in its configuration, but specifically, may include any one selected from a group of crushing devices consisting of a vertical pulverizer, a turbo cutter, a turbo grinder, a rotary cutter mill, a cutter mill, a disc mill, a shred crusher, a crusher, a chopper, and a disc cutter, but is not limited to the examples described above.
- the coarse grinding step can be performed so that the particle size of the functional gel polymer is about 2 mm to about 10 mm. Grinding to a particle size of less than 2 mm is not technically easy due to the high moisture content of the functional gel polymer, and also, the phenomenon of agglomeration may occur between the ground particles. On the other hand, if the particle size is more than 10 mm, the effect of increasing the efficiency of the subsequent drying step may be minimal.
- the above drying can be performed at a temperature of 120 to 250°C, 140 to 200°C, or 150 to 190°C.
- the drying temperature can be defined as the temperature of the heat medium supplied for drying or the temperature inside the drying reactor including the heat medium and the polymer in the drying process. If the drying temperature is low and the drying time is long, the process efficiency is lowered, so that the drying temperature is preferably 120°C or higher to prevent this. In addition, if the drying temperature is excessively high, the surface of the functional gel polymer may be excessively dried, which may increase the occurrence of fine powder in the subsequent pulverization step, and the physical properties of the final resin may deteriorate, so that the drying temperature is preferably 250°C or lower to prevent this.
- the drying time in the drying step is not particularly limited, but may be adjusted to 20 to 90 minutes under the drying temperature, taking into consideration process efficiency and the properties of the resin.
- the above drying can be accomplished using a conventional medium, for example, by supplying hot air to the pulverized functional gel polymer, infrared irradiation, ultrasonic wave irradiation, or ultraviolet irradiation.
- drying is performed so that the dried polymer has a moisture content of 0.1 to 10 wt%. That is, if the moisture content of the dried polymer is less than 0.1 wt%, excessive drying may cause an increase in manufacturing cost and decomposition of the crosslinked polymer, which is not preferable. In addition, if the moisture content of the dried polymer exceeds 10 wt%, defects may occur in subsequent processes, which is not preferable.
- the dried functional gel polymer can be pulverized. This is a step for optimizing the surface area of the base resin powder and the superabsorbent resin.
- the pulverization can be performed so that the particle size of the pulverized polymer becomes 150 to 850 ⁇ m.
- Common grinders that can be used at this time include pin mills, hammer mills, screw mills, roll mills, disc mills, and jog mills.
- a step of selectively classifying particles having a particle size of 150 to 850 ⁇ m from the polymer particles obtained through the pulverizing step may be further performed.
- the base resin powder can have a particle size of 150 to 850 ⁇ m, and can contain 2 wt% or less, or 1 wt% or less, of fine powder having a particle size of less than 150 ⁇ m.
- Step 3 of the present invention is a step of mixing the base resin with a deodorizing agent such as MOF (metal organic framework) or an ion exchange resin.
- a deodorizing agent such as MOF (metal organic framework) or an ion exchange resin.
- Metal-organic framework also known as metal-organic framework, is an organic-inorganic hybrid material in which metal ions or ion clusters coordinate with organic ligands to have a primary, secondary, or tertiary structure.
- MOFs can be created depending on the selection of metal ions and organic ligands.
- the above MOF has the characteristic of being porous with empty spaces within the structure, and the pore size, porosity, three-dimensional structure, surface area, etc. can be designed in various ways depending on the type and bonding method of the metal ions and organic ligands forming the MOF.
- MOF Due to this porosity, MOF has adsorptive properties for various organic compounds, and especially, compared to the widely known zeolites or activated carbons, it shows excellent adsorptive properties for various substances, and thus, it is receiving attention as a next-generation functional adsorbent.
- the MOF does not easily deform at high temperatures and has a solid skeleton, so it has excellent chemical stability and thermal stability.
- some of the MOFs are also known to have antibacterial properties against microorganisms.
- the inventors of the present invention confirmed that when such MOF is included in a superabsorbent resin, it has excellent deodorizing properties that suppress various deodorizing substances while being harmless to the human body and without impairing the inherent properties of the superabsorbent resin.
- the MOF may include at least one metal ion selected from the group consisting of Zn, Ti, Co, Al, and Zr, and at least one organic ligand selected from the group consisting of imidazole, alkylimidazole, alkoxyimidazole, terephthalic acid, and aminoterephthalic acid.
- the MOF may include at least one selected from the group consisting of, for example, Zn-MOF (ZIF-8, Zn 2+ +2-methylimidazole)), Zn-MOF (ZIF-67, (Co 2+ +2-methylimidazole)), Ti-MOF (Tn 2+ +2-methylimidazole), NH 2 -UiO-66 (Zr 4+ +2-aminoterephthalic acid), and NH 2 -MIL-101 (Al 3+ +2-aminoterephthalic acid), but the present invention is not limited thereto.
- ion exchange resins when included in superabsorbent resins, they have excellent deodorizing properties that suppress various deodorizing substances while being harmless to the human body and without impairing the inherent properties of superabsorbent resins.
- a hydrophobic ion exchange resin so as to be advantageous in removing malodorous components that are generally hydrophobic as the ion exchange resin
- a polystyrene-divinylbenzene-based resin, a polymethacrylate-divinylbenzene-based resin, or a polyacrylate-divinylbenzene-based resin can be used.
- the resin may include at least one selected from the group consisting of commercially available Amberlite XAD, Samyang Trilite, Samyang DIAION, and the like, but the present invention is not limited thereto.
- the above deodorant may be independently included in an amount of 1 to 10 parts by weight, respectively, relative to 100 parts by weight of the base resin.
- the MOF or ion exchange resin may be included in an amount of 1 part by weight or more, 2 parts by weight or more, 3 parts by weight or more, 4 parts by weight or more, or 5 parts by weight or more, but 10 parts by weight or less, relative to 100 parts by weight of the base resin.
- the deodorizing effect that effectively controls odors caused by various causes can be maintained for a long time while maintaining the white color and without lowering the basic properties of the superabsorbent resin, such as water retention capacity and absorbency under pressure, and the absorption speed.
- Step 4 of the present invention is a step of performing a surface crosslinking reaction on the mixture of the base resin and the deodorant obtained in step 3 in the presence of a surface crosslinking solution containing a surface crosslinking agent.
- a surface cross-linking layer is formed on the surface of the base resin particles.
- the formation of the above surface cross-linking layer can be performed by a conventional method for increasing the cross-linking density of the surface of the polymer particles, and for example, can be performed by a method of mixing a surface cross-linking solution containing a surface cross-linking agent with the above pulverized polymer and performing a heat treatment to cause a cross-linking reaction.
- the above surface cross-linking step can be performed at a temperature of about 80° C. to about 250° C. More specifically, the surface cross-linking process can be performed at a temperature of about 100° C. to about 220° C., or about 110° C. to about 200° C., or about 120° C. to about 190° C., for about 10 minutes to about 2 hours, or about 20 minutes to about 60 minutes. If the cross-linking reaction temperature is less than 160° C. or the reaction time is too short, the surface cross-linking reaction may not occur properly, which may lower the transmittance, and if it exceeds 200° C. or the reaction time is too long, a problem of lowering the water retention capacity may occur.
- the means for increasing the temperature for the surface crosslinking reaction is not particularly limited. Heating can be performed by supplying a heat medium or directly supplying a heat source.
- the types of heat medium that can be used include heated fluids such as steam, hot air, and hot oil, but the present invention is not limited thereto, and the temperature of the supplied heat medium can be appropriately selected in consideration of the means of the heat medium, the heating rate, and the target temperature for heating.
- a directly supplied heat source heating using electricity and heating using gas can be mentioned, but the present invention is not limited to the above-described examples.
- the above surface cross-linking solution contains a surface cross-linking agent, and the surface cross-linking agent is a surface cross-linking agent generally used for surface cross-linking of superabsorbent resins, and is a compound capable of reacting with a functional group of a polymer, without any special limitations.
- At least one selected from the group consisting of polyhydric alcohol compounds; epoxy compounds; polyamine compounds; haloepoxy compounds; condensation products of haloepoxy compounds; oxazoline compounds; mono-, di- or polyoxazolidinone compounds; cyclic urea compounds; polyhydric metal salts; and alkylene carbonate compounds may be used as the surface crosslinking agent.
- examples of the polyhydric alcohol compound include at least one selected from the group consisting of mono-, di-, tri-, tetra- or polyethylene glycol, monopropylene glycol, 1,3-propanediol, dipropylene glycol, 2,3,4-trimethyl-1,3-pentanediol, polypropylene glycol, glycerol, polyglycerol, 2-butene-1,4-diol, 1,4-butanediol, 1,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, and 1,2-cyclohexanedimethanol.
- epoxy compound ethylene glycol diglycidyl ether and glycidol
- polyamine compound at least one selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetraamine, tetraethylenepentamine, pentaethylenehexamine, polyethyleneimine, and polyamidepolyamine can be used.
- haloepoxy compounds epichlorohydrin, epibromohydrin and ⁇ -methylepichlorohydrin can be used.
- mono-, di- or polyoxazolidinone compounds for example, 2-oxazolidinone can be used.
- alkylene carbonate compound ethylene carbonate, etc.
- these can be used alone or in combination.
- polyhydric alcohol compounds having 2 to 10 carbon atoms can be included and used among these surface crosslinking agents.
- the content of the surface cross-linking agent added above can be appropriately selected depending on the type of surface cross-linking agent specifically added or the reaction conditions, but can usually be used in an amount of about 0.001 to about 5 parts by weight, preferably about 0.01 to about 3 parts by weight, and more preferably about 0.05 to about 2 parts by weight, per 100 parts by weight of the polymer.
- the content of the surface cross-linking agent is too small, the surface cross-linking reaction hardly occurs, and if it exceeds 5 parts by weight per 100 parts by weight of the polymer, excessive surface cross-linking reaction may occur, resulting in a decrease in absorption capacity and physical properties.
- the surface cross-linking solution may additionally contain an inorganic material.
- the inorganic material at least one inorganic material selected from the group consisting of silica, clay, alumina, silica-alumina composite, titania, zinc oxide, and aluminum sulfate may be used.
- the inorganic material may be used in powder form or liquid form, and in particular, may be used as alumina powder, silica-alumina powder, titania powder, or nano silica solution.
- the inorganic material may be used in an amount of about 0.001 to about 1 part by weight based on 100 parts by weight of the base resin.
- the above surface cross-linking solution may use water as a solvent.
- the water content may be appropriately adjusted to induce even dispersion of the surface cross-linking agent and deodorant, prevent agglomeration of the base resin powder, and optimize the surface penetration depth of the cross-linking agent.
- the base resin expands due to the surface crosslinking solution, and a portion of the deodorant particles can be physically attached to the base resin.
- the deodorant particles are embedded in the polymer chain of the base resin and supported. Therefore, the combined state is maintained without being easily detached until subsequent processes such as the surface crosslinking step or until the product such as a diaper is completed, and when the resin expands and detaches when wet with urine, a cause of an odor, it can be widely distributed and exhibit a deodorizing function.
- a chelating agent or an organic acid may be further mixed in the surface cross-linking step or thereafter to improve deodorizing ability.
- the chelating agent may include at least one selected from the group consisting of ethylenediaminetetraacetic acid (EDTA), L-glutamic acid diacetic acid (GLDA), methyl glycine diacetic acid (MGDA), hydroxyethylethylenediaminetriacetic acid (HEDTA), ethanol diglycinate (EDG), diethylenetriaminepentaacetic acid (DTPA), and salts thereof. More specifically, the chelating agent may be ethylenediaminetetraacetic acid (EDTA) or L-glutamic acid diacetic acid (GLDA).
- the organic acid may be at least one selected from the group consisting of citric acid, acetic acid, formic acid, fumaric acid, lactic acid, and propionic acid.
- the organic acid may be citric acid.
- the above chelating agent and organic acid may be independently included in an amount of 0.1 to 2 parts by weight, respectively, relative to 100 parts by weight of the base resin.
- the amount may be 0.1 parts by weight or more, 0.3 parts by weight or more, 0.5 parts by weight or more, 0.7 parts by weight or more, or 1 part by weight or more, but 2 parts by weight or less, 1.7 parts by weight or less, 1.5 parts by weight or less, or 1.3 parts by weight or less, relative to 100 parts by weight of the base resin.
- the deodorizing ability of the superabsorbent resin can be further improved without lowering the absorption properties.
- the above chelating agent can be used in the form of a salt mixed with an aqueous solution, and the above content range is based on the solid content.
- a superabsorbent resin is
- a base resin complex comprising an acrylic acid monomer containing an acid group, wherein at least a portion of the acid group is neutralized, and a base resin polymerized with an internal cross-linking agent, and wherein at least a portion of a deodorizing agent is supported on the polymer chain of the base resin;
- the above deodorant includes a metal organic framework (MOF) or an ion exchange resin.
- MOF metal organic framework
- ion exchange resin an ion exchange resin
- the above base resin complex is manufactured by mixing the base resin and a deodorant, MOF (metal organic framework) or ion exchange resin, and then performing a surface crosslinking reaction, so that the base resin and the deodorant are physically mixed, and some of the deodorant particles are embedded in the base resin chain and supported through surface crosslinking. Therefore, the combined state is maintained without being easily detached until the subsequent process or the product such as a diaper is completed, and when it gets wet with urine, which is the cause of the odor, the superabsorbent resin expands and the deodorant is detached and distributed over a wide area, thereby exhibiting a deodorizing function.
- MOF metal organic framework
- ion exchange resin ion exchange resin
- the raw materials used in the base resin including the acrylic acid monomer and the internal crosslinking agent, and the manufacturing method are as described above in the manufacturing method of the superabsorbent resin.
- the type, content, and characteristics of the deodorant are as described above in the method for manufacturing a superabsorbent resin.
- the surface cross-linking agent forming the surface cross-linking layer and the manufacturing method are as described above in the manufacturing method of the superabsorbent resin.
- the MOF comprises at least one metal ion selected from the group consisting of Zn, Ti, Co, Al, and Zr, and at least one organic ligand selected from the group consisting of imidazole, alkylimidazole, alkoxyimidazole, terephthalic acid, and aminoterephthalic acid.
- the ion exchange resin includes a resin of the polystyrene-divinylbenzene type, the polymethacrylate-divinylbenzene type, or the polyacrylate-divinylbenzene type.
- the deodorant may be mixed in an amount of 1 to 10 parts by weight per 100 parts by weight of the base resin.
- the superabsorbent resin according to one embodiment of the present invention may further include a chelating agent or an organic acid to improve deodorizing performance.
- the chelating agent may include at least one selected from the group consisting of ethylenediaminetetraacetic acid (EDTA), L-glutamic acid diacetic acid (GLDA), methyl glycine diacetic acid (MGDA), hydroxyethylethylenediaminetriacetic acid (HEDTA), ethanol diglycinate (EDG), diethylenetriaminepentaacetic acid (DTPA), and salts thereof. More specifically, the chelating agent may be ethylenediaminetetraacetic acid (EDTA) or L-glutamic acid diacetic acid (GLDA).
- the organic acid may be at least one selected from the group consisting of citric acid, acetic acid, formic acid, fumaric acid, lactic acid, and propionic acid.
- the organic acid may be citric acid.
- the above chelating agent and organic acid may be independently included in an amount of 0.1 to 2 parts by weight, respectively, relative to 100 parts by weight of the base resin.
- the amount may be 0.1 parts by weight or more, 0.3 parts by weight or more, 0.5 parts by weight or more, 0.7 parts by weight or more, or 1 part by weight or more, but 2 parts by weight or less, 1.7 parts by weight or less, 1.5 parts by weight or less, or 1.3 parts by weight or less, relative to 100 parts by weight of the base resin.
- the deodorizing ability of the superabsorbent resin can be further improved without lowering the absorption properties.
- the above chelating agent can be used in the form of a salt mixed with an aqueous solution, and the above content range is based on the solid content.
- a monomer solution composition having a monomer concentration of 45.8 wt% was prepared by mixing 100 g of acrylic acid, 0.37 g of N,N'-methylenebisacrylamide as a crosslinker, 0.15 g of sodium persulfate (SPS) as a thermal initiator, 0.008 g of benzoin ether as a UV initiator, 40 g of caustic soda (NaOH), and 127 g of water.
- SPS sodium persulfate
- benzoin ether as a UV initiator
- NaOH caustic soda
- the monomer solution composition was fed into a supply section of a polymerization device equipped with a continuously moving conveyor belt, and then irradiated with ultraviolet rays using a UV irradiation device while maintaining a polymerization atmosphere temperature of 80°C (irradiation dose: 10 mW/cm 2 ), and UV polymerization was performed for 2 minutes to prepare a hydrogel polymer.
- the above-mentioned functional gel polymer was transferred to a meat chopper and cut into 2 mm to 10 mm. At this time, the moisture content of the cut functional gel polymer was 47 wt%. Then, the functional gel polymer was dried in a hot air dryer at a temperature of 170°C for 30 minutes, and the dried functional gel polymer was pulverized with a pin mill. Then, the particle size was reduced by a sieve. A polymer having a particle size of 150 ⁇ m to 850 ⁇ m was classified to produce a base resin having a moisture content of 1 wt% or less.
- Zn-MOF ZIF-8, Zn 2+ +2-methylimidazole
- a surface cross-linking agent (2.5 parts by weight of water, 0.1 part by weight of ethylene glycol diglycidyl ether (EX-810), 0.1 part by weight of aluminum sulfate 18 hydrate (Al-S), and 0.1 part by weight of silica (Aerosil A200) was evenly mixed based on 100 parts by weight of the base resin.
- a surface cross-linking reaction was performed on the mixture at 140°C for 30 minutes. After completion of the surface cross-linking reaction, the mixture was classified using a sieve to obtain a superabsorbent resin having a particle size of 150 to 850 ⁇ m.
- Example 1 a superabsorbent resin was manufactured in the same manner as in Example 1, except that 5 parts by weight of Zn-MOF (ZIF-8, Zn 2+ +2-methylimidazole)) as a deodorant was mixed by stirring in a dry state with respect to 100 parts by weight of the base resin manufactured above.
- Zn-MOF ZIF-8, Zn 2+ +2-methylimidazole
- Example 1 a superabsorbent resin was manufactured in the same manner as in Example 1, except that 2 parts by weight of Zn-MOF (ZIF-8, Zn 2+ +2-methylimidazole)) as a deodorant was mixed by stirring in a dry state with respect to 100 parts by weight of the base resin manufactured above.
- Zn-MOF ZIF-8, Zn 2+ +2-methylimidazole
- Example 1 a superabsorbent resin was manufactured in the same manner as in Example 1, except that 10 parts by weight of Ti-MOF (Tn 2+ +2-methylimidazole) as a deodorant was mixed by stirring in a dry state with respect to 100 parts by weight of the base resin manufactured above.
- Ti-MOF Ti-MOF
- Example 1 a superabsorbent resin was manufactured in the same manner as in Example 1, except that 10 parts by weight of ion exchange resin Amberlite XAD4 (purchased from: AlFA) was mixed by stirring in a dry state with respect to 100 parts by weight of the base resin manufactured above.
- ion exchange resin Amberlite XAD4 purchased from: AlFA
- the manufacturing process for the base resin was the same as in Example 1.
- Zn-MOF ZIF-8, Zn 2+ +2-methylimidazole
- a surface cross-linking agent (2.5 parts by weight of water, 0.1 part by weight of ethylene glycol diglycidyl ether (EX-810), 0.1 part by weight of aluminum sulfate 18 hydrate (Al-S), and 0.1 part by weight of silica (Aerosil A200) was evenly mixed based on 100 parts by weight of the base resin.
- a surface cross-linking reaction was performed on the mixture at 140°C for 30 minutes.
- a citric acid aqueous solution was prepared so that 5 parts by weight of citric acid was used for 100 parts by weight of the base resin, and the solution was mixed by spraying it onto the superabsorbent resin. After that, the solution was dried at 80°C for 25 minutes and then classified using a sieve to obtain a superabsorbent resin having a particle size of 150 to 850 ⁇ m.
- the manufacturing process for the base resin was the same as in Example 1.
- Zn-MOF ZIF-8, Zn 2+ +2-methylimidazole
- a surface cross-linking agent (2.5 parts by weight of water, 0.1 part by weight of ethylene glycol diglycidyl ether (EX-810), 0.1 part by weight of aluminum sulfate 18 hydrate (Al-S), and 0.1 part by weight of silica (Aerosil A200) was evenly mixed based on 100 parts by weight of the base resin.
- a surface cross-linking reaction was performed on the mixture at 140°C for 30 minutes.
- an EDTA aqueous solution was prepared so that 5 parts by weight of EDTA was used for 100 parts by weight of the base resin, and the solution was sprayed onto the superabsorbent resin to mix. Afterwards, the solution was dried at 80°C for 25 minutes and then classified using a sieve to obtain a superabsorbent resin having a particle size of 150 to 850 ⁇ m.
- a monomer solution composition having a monomer concentration of 45.8 wt% was prepared by mixing 100 g of acrylic acid, 0.37 g of N,N'-methylenebisacrylamide as a crosslinker, 0.15 g of sodium persulfate (SPS) as a thermal initiator, 0.008 g of benzoin ether as a UV initiator, 40 g of caustic soda (NaOH), and 127 g of water.
- SPS sodium persulfate
- benzoin ether as a UV initiator
- NaOH caustic soda
- the monomer solution composition was fed into a supply section of a polymerization device equipped with a continuously moving conveyor belt, and then irradiated with ultraviolet rays using a UV irradiation device while maintaining a polymerization atmosphere temperature of 80°C (irradiation dose: 10 mW/cm 2 ), and UV polymerization was performed for 2 minutes to prepare a hydrogel polymer.
- the above-mentioned functional gel polymer was transferred to a meat chopper and cut into 2 mm to 10 mm. At this time, the moisture content of the cut functional gel polymer was 47 wt%. Then, the functional gel polymer was dried in a hot air dryer at a temperature of 170°C for 30 minutes, and the dried functional gel polymer was pulverized with a pin mill pulverizer. Then, the polymer having a particle size of 150 ⁇ m to 850 ⁇ m was classified using a sieve to have a moisture content of 1 wt% or less. A base resin was manufactured.
- a surface cross-linking agent (2.5 parts by weight of water, 0.1 part by weight of ethylene glycol diglycidyl ether (EX-810), 0.1 part by weight of aluminum sulfate 18 hydrate (Al-S), and 0.1 part by weight of silica (Aerosil A200)) was evenly mixed with 100 parts by weight of the base resin.
- a surface cross-linking reaction was performed on the mixture at 140°C for 30 minutes. After completion of the surface cross-linking reaction, the mixture was classified using a sieve to obtain a superabsorbent resin having a particle size of 150 to 850 ⁇ m.
- Comparative Example 1 after the surface crosslinking reaction was completed, an EDTA aqueous solution was prepared so that 1 part by weight of EDTA was used for 100 parts by weight of the base resin, and the solution was mixed by spraying it onto the superabsorbent resin. Afterwards, it was dried at 80°C for 25 minutes and then sieved using a sieve. By classification, a superabsorbent resin having a particle size of 150 to 850 ⁇ m was obtained.
- Comparative Example 1 after the surface cross-linking reaction was completed, an aqueous citric acid solution was prepared so that 5 parts by weight of citric acid was used for 100 parts by weight of the base resin, and the solution was mixed by spraying it onto the superabsorbent resin. Thereafter, the solution was dried at 80° C. for 25 minutes and then classified using a sieve to obtain a superabsorbent resin having a particle size of 150 to 850 ⁇ m.
- Example 1 a superabsorbent resin was manufactured in the same manner as in Example 1, except that 5 parts by weight of volcanic ash as a deodorant was mixed by stirring in a dry state with respect to 100 parts by weight of the base resin manufactured above.
- Example 1 a superabsorbent resin was manufactured in the same manner as in Example 1, except that 10 parts by weight of Laponite (Laponite XLS) as a deodorant was mixed in a dry state by stirring with respect to 100 parts by weight of the base resin manufactured above.
- Laponite Laponite XLS
- Deodorant Additives type Content* Point of investment type Content* Point of investment Example 1 Zn-MOF 10 Mixed into base resin before surface crosslinking - Example 2 Zn-MOF 5 Mixed into base resin before surface crosslinking - Example 3 Zn-MOF 2 Mixed into base resin before surface crosslinking - Example 4 Ti-MOF 10 Mixed into base resin before surface crosslinking - Example 5 ion exchange resin 10 Mixed into base resin before surface crosslinking - Example 6 Zn-MOF 5 Mixed into base resin before surface crosslinking Citric acid 5 After surface cross-linking Example 7 Zn-MOF 5 Mixed into base resin before surface crosslinking EDTA 1 After surface cross-linking Comparative Example 1 - - Comparative Example 2 - EDTA 1 After surface cross-linking Comparative Example 3 - Citric acid 5 After surface cross-linking Comparative Example 4 volcanic ash 5 Mixed into base resin before surface crosslinking Comparative Example 5 Laponite 10 Mixed into base resin before surface crosslinking
- each physical property was measured using the following methods.
- saline solution or saline refers to a 0.9 wt% sodium chloride (NaCl) aqueous solution.
- the water retention capacity of the superabsorbent resins of the above examples and comparative examples by the no-load absorption rate was measured according to the European Disposables and Nonwovens Association (EDANA) standard EDANA WSP 241.3.
- EDANA European Disposables and Nonwovens Association
- superabsorbent resin W 0 (g) (about 0.2 g) obtained through each of the examples and comparative examples was uniformly placed in a nonwoven bag, sealed, and then immersed in saline solution (0.9 wt%) at room temperature. After 30 minutes, water was removed from the bag for 3 minutes using a centrifuge at 250 G, and the mass W 2 (g) of the bag was measured. In addition, the same operation was performed without using the resin, and then the mass W 1 (g) at that time was measured.
- CRC (g/g) ⁇ [W 2 (g) - W 1 (g)]/W 0 (g) ⁇ - 1
- the pressurized absorption capacity of 0.7 psi of the superabsorbent resins of the above examples and comparative examples was measured according to the EDANA method WSP 242.3.
- a 400 mesh stainless steel wire mesh was installed on the bottom of a plastic cylinder with an inner diameter of 25 mm.
- a superabsorbent resin W 0 (g) was uniformly sprayed on the wire mesh, and a piston capable of uniformly applying a load of 0.7 psi thereon was installed, which had an outer diameter slightly smaller than 25 mm, no gap with the inner wall of the cylinder, and was not obstructed in its up-and-down movement.
- the weight W 3 (g) of the device was measured.
- a glass filter with a diameter of 90 mm and a thickness of 5 mm was placed on the inside of a petroleum dish with a diameter of 150 mm, and a saline solution consisting of 0.9 wt% sodium chloride was placed so that it was at the same level as the upper surface of the glass filter.
- a sheet of filter paper with a diameter of 90 mm was placed thereon.
- the measuring device was placed on the filter paper, and the liquid was absorbed under a load for 1 hour. After 1 hour, the measuring device was lifted, and its weight W 4 (g) was measured. Using each mass obtained, the absorbency under pressure (g/g) was calculated according to the following calculation formula 2.
- AUP(g/g) [W 4 (g) - W 3 (g)]/W 0 (g)
- Guaiacol a phenolic compound that is a malodorous substance, dimethyl trisulfide, a sulfur compound, and 3-methyl butanal, an aldehyde compound, were selected and their deodorizing ability was tested using the adsorption tube evaluation method.
- the color evaluation was performed by spreading 5g of superabsorbent resin thinly on an aluminum dish and measuring it with a colorimeter, Labscan XE (manufactured by HunterLab). The measured values were output as three parameters: L, a, and b. This was substituted into the formula below to calculate the color evaluation value (WI; Whiteness Index). At this time, the higher the WI value, the closer it is to white.
- WI Whiteness Index
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Epidemiology (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
| 소취제 | 첨가제 | |||||
| 종류 | 함량* | 투입시점 | 종류 | 함량* | 투입시점 | |
| 실시예 1 | Zn-MOF | 10 | 표면 가교전 베이스 수지에 혼합 | - | ||
| 실시예 2 | Zn-MOF | 5 | 표면 가교전 베이스 수지에 혼합 | - | ||
| 실시예 3 | Zn-MOF | 2 | 표면 가교전 베이스 수지에 혼합 | - | ||
| 실시예 4 | Ti-MOF | 10 | 표면 가교전 베이스 수지에 혼합 | - | ||
| 실시예 5 | 이온교환수지 | 10 | 표면 가교전 베이스 수지에 혼합 | - | ||
| 실시예 6 | Zn-MOF | 5 | 표면 가교전 베이스 수지에 혼합 | 시트르산 | 5 | 표면가교 후 |
| 실시예 7 | Zn-MOF | 5 | 표면 가교전 베이스 수지에 혼합 | EDTA | 1 | 표면가교 후 |
| 비교예 1 | - | - | ||||
| 비교예 2 | - | EDTA | 1 | 표면가교 후 | ||
| 비교예 3 | - | 시트르산 | 5 | 표면가교후 | ||
| 비교예 4 | 화산재 | 5 | 표면 가교전 베이스 수지에 혼합 | |||
| 비교예 5 | 라포나이트 | 10 | 표면 가교전 베이스 수지에 혼합 | |||
| CRC (단위:g/g) |
0.7 psi AUP (단위:g/g) |
소취능 (흡착관 평가) (단위:%) | 색상 평가 (WI) |
||||
| 알데히드 |
페놀 |
황 | 평균 | ||||
| 실시예 1 | 36.2 | 16.2 | 45 | 41 | 81 | 55.7 | 75.0 |
| 실시예 2 | 36.3 | 16.5 | 21 | 49 | 65 | 45 | 75.5 |
| 실시예 3 | 36.8 | 16.8 | 10 | 29 | 31 | 23.3 | 75.6 |
| 실시예 4 | 35.9 | 16.1 | 19 | 32 | 66 | 39 | 74.9 |
| 실시예 5 | 36.0 | 16.3 | 51 | 71 | 95 | 72.3 | 75.1 |
| 실시예 6 | 36.2 | 15.9 | 32 | 51 | 73 | 52 | 73.1 |
| 실시예 7 | 36.1 | 15.8 | 31 | 50 | 72 | 51 | 76.0 |
| 비교예 1 | 37.3 | 18.0 | 0 | 0 | 0 | 0 | 76.1 |
| 비교예 2 | 37.0 | 17.0 | 0 | 0 | 20 | 6.7 | 76.1 |
| 비교예 3 | 37.3 | 16.8 | 15 | 0 | 21 | 12 | 72.2 |
| 비교예 4 | 35.9 | 15.1 | 33 | 54 | 45 | 44 | 43.4 |
| 비교예 5 | 36.2 | 16.0 | 8 | 16 | 18 | 14 | 76.0 |
Claims (15)
- 산성기를 포함하고, 상기 산성기의 적어도 일부가 중화된 아크릴산계 단량체, 내부 가교제, 및 중합 개시제를 포함하는 단량체 조성물에 대하여 중합을 수행하여 함수겔 중합체를 형성하는 단계 (단계 1);상기 함수겔 중합체를 건조, 분쇄 및 분급하여 베이스 수지를 형성하는 단계 (단계 2);상기 베이스 수지와 소취제를 혼합하는 단계 (단계 3); 및표면 가교제를 포함하는 표면 가교 용액의 존재 하에, 상기 베이스 수지 및 소취제의 혼합물에 대하여 표면 가교 반응을 수행하는 단계(단계 4)를 포함하고,상기 소취제는 MOF(metal organic framework), 또는 이온교환수지를 포함하는,고흡수성 수지의 제조방법.
- 제1항에 있어서,상기 MOF는 Zn, Ti, Co, Al, 및 Zr로 이루어진 군으로부터 선택되는 1종 이상의 금속 이온과, 이미다졸(imidazole), 알킬이미다졸(alkylimidazole), 알콕시이미다졸(alkoxyimidazole), 테레프탈산(terephthalic acid), 및 아미노테레프탈산(aminoterephthalic acid)으로 이루어진 군으로부터 선택되는 1종 이상의 유기 리간드를 포함하는,고흡수성 수지의 제조방법.
- 제1항에 있어서,상기 이온교환수지는 폴리스티렌-디비닐벤젠(Polystyrene-divinylbenzene)계, 폴리메타크릴레이트-디비닐벤젠(Polymethacrylate-divinylbenzene)계, 또는 폴리아크릴레이트-디비닐벤젠(Polyacrylate-divinylbenzene)계 수지를 포함하는,고흡수성 수지의 제조방법.
- 제1항에 있어서,상기 소취제는 상기 베이스 수지 100 중량부에 대하여 1 내지 10 중량부로 혼합되는,고흡수성 수지의 제조방법.
- 제1항에 있어서,상기 단계 4 또는 그 이후에, 킬레이트제, 또는 유기산을 더 혼합하는,고흡수성 수지의 제조방법.
- 제5항에 있어서,상기 킬레이트제는, 에틸렌디아민테트라아세트산(EDTA), L-글루타민산디아세트산(GLDA), 메틸 글리신 다이아세트산(MGDA), 하이드록시에틸에틸렌디아민트리아세트산(HEDTA), 에탄올디글리신산(EDG), 디에틸렌트리아민펜타아세트산(DTPA) 및 이들의 염으로 이루어진 군 중에서 선택된 1 종 이상을 포함하는,고흡수성 수지의 제조방법.
- 제5항에 있어서,상기 유기산은 시트르산, 아세트산, 포름산, 푸마르산, 락트산, 및 프로피온산으로 이루어진 군 중에서 선택된 1종 이상을 포함하는,고흡수성 수지의 제조방법.
- 제5항에 있어서,상기 킬레이트제, 또는 유기산은 각각 독립적으로 상기 베이스 수지 100 중량부에 대하여 0.1 내지 5 중량부로 혼합되는,고흡수성 수지의 제조방법.
- 산성기를 포함하고, 상기 산성기의 적어도 일부가 중화된 아크릴산계 단량체, 및 내부 가교제가 중합된 베이스 수지와, 상기 베이스 수지의 고분자 체인에 소취제의 적어도 일부가 담지된 베이스 수지 복합체; 및상기 베이스 수지의 표면에 형성된 표면 가교층을 포함하고,상기 소취제는 MOF(metal organic framework), 또는 이온교환수지를 포함하는,고흡수성 수지.
- 제9항에 있어서,상기 MOF는 Zn, Ti, Co, Al, 및 Zr로 이루어진 군으로부터 선택되는 1종 이상의 금속 이온과, 이미다졸(imidazole), 알킬이미다졸(alkylimidazole), 알콕시이미다졸(alkoxyimidazole), 테레프탈산(terephthalic acid), 및 아미노테레프탈산(aminoterephthalic acid)으로 이루어진 군으로부터 선택되는 1종 이상의 유기 리간드를 포함하는,고흡수성 수지.
- 제9항에 있어서,상기 이온교환수지는 폴리스티렌-디비닐벤젠(Polystyrene-divinylbenzene)계, 폴리메타크릴레이트-디비닐벤젠(Polymethacrylate-divinylbenzene)계, 또는 폴리아크릴레이트-디비닐벤젠(Polyacrylate-divinylbenzene)계 수지를 포함하는,고흡수성 수지.
- 제9항에 있어서,상기 소취제는 상기 베이스 수지 100 중량부에 대하여 1 내지 10 중량부로 포함되는,고흡수성 수지.
- 제9항에 있어서,킬레이트제, 또는 유기산을 더 포함하는,고흡수성 수지.
- 제13항에 있어서,상기 킬레이트제는, 에틸렌디아민테트라아세트산(EDTA), L-글루타민산디아세트산(GLDA), 메틸 글리신 다이아세트산(MGDA), 하이드록시에틸에틸렌디아민트리아세트산(HEDTA), 에탄올디글리신산(EDG), 디에틸렌트리아민펜타아세트산(DTPA) 및 이들의 염으로 이루어진 군 중에서 선택된 1 종 이상을 포함하는,고흡수성 수지.
- 제13항에 있어서,상기 유기산은 시트르산, 아세트산, 포름산, 푸마르산, 락트산, 및 프로피온산으로 이루어진 군 중에서 선택된 1종 이상을 포함하는,고흡수성 수지.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202480004485.3A CN120077084A (zh) | 2023-02-14 | 2024-02-14 | 超吸收性聚合物及其制备方法 |
| EP24757251.4A EP4617303A4 (en) | 2023-02-14 | 2024-02-14 | SUPERABSORBENT POLYMER AND ITS PREPARATION PROCESS |
| JP2025523953A JP2026507987A (ja) | 2023-02-14 | 2024-02-14 | 高吸水性樹脂およびその製造方法 |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2023-0019560 | 2023-02-14 | ||
| KR20230019560 | 2023-02-14 | ||
| KR10-2024-0020382 | 2024-02-13 | ||
| KR1020240020382A KR20240126836A (ko) | 2023-02-14 | 2024-02-13 | 고흡수성 수지 및 이의 제조 방법 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024172530A1 true WO2024172530A1 (ko) | 2024-08-22 |
Family
ID=92420219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2024/095142 Ceased WO2024172530A1 (ko) | 2023-02-14 | 2024-02-14 | 고흡수성 수지 및 이의 제조 방법 |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4617303A4 (ko) |
| JP (1) | JP2026507987A (ko) |
| CN (1) | CN120077084A (ko) |
| WO (1) | WO2024172530A1 (ko) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050081606A (ko) * | 2004-02-16 | 2005-08-19 | 최용석 | 화학흡착제 및 이의 제조방법 |
| JP2017205225A (ja) * | 2016-05-17 | 2017-11-24 | オルガノ株式会社 | 臭気低減方法、臭気低減用袋および吸収性物品 |
| KR20190035313A (ko) * | 2017-09-26 | 2019-04-03 | 주식회사 엘지화학 | 항균성 고흡수성 수지의 제조 방법 |
| JP2019088499A (ja) * | 2017-11-15 | 2019-06-13 | 大原パラヂウム化学株式会社 | 生活臭用消臭剤 |
| KR20210001839A (ko) * | 2019-06-26 | 2021-01-06 | 한국생산기술연구원 | 악취 제거용 조성물 및 그의 제조방법 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007035596A2 (en) * | 2005-09-19 | 2007-03-29 | Mastertaste Inc. | Metal organic framework odor sequestration and fragrance delivery |
| DE102005055497A1 (de) * | 2005-11-18 | 2007-05-31 | Stockhausen Gmbh | Geruchsbindende superabsorbierende Zusammensetzung |
-
2024
- 2024-02-14 WO PCT/KR2024/095142 patent/WO2024172530A1/ko not_active Ceased
- 2024-02-14 JP JP2025523953A patent/JP2026507987A/ja active Pending
- 2024-02-14 EP EP24757251.4A patent/EP4617303A4/en active Pending
- 2024-02-14 CN CN202480004485.3A patent/CN120077084A/zh active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050081606A (ko) * | 2004-02-16 | 2005-08-19 | 최용석 | 화학흡착제 및 이의 제조방법 |
| JP2017205225A (ja) * | 2016-05-17 | 2017-11-24 | オルガノ株式会社 | 臭気低減方法、臭気低減用袋および吸収性物品 |
| KR20190035313A (ko) * | 2017-09-26 | 2019-04-03 | 주식회사 엘지화학 | 항균성 고흡수성 수지의 제조 방법 |
| JP2019088499A (ja) * | 2017-11-15 | 2019-06-13 | 大原パラヂウム化学株式会社 | 生活臭用消臭剤 |
| KR20210001839A (ko) * | 2019-06-26 | 2021-01-06 | 한국생산기술연구원 | 악취 제거용 조성물 및 그의 제조방법 |
Non-Patent Citations (3)
| Title |
|---|
| ODIAN: "Principle of Polymerization", 1981, WILEY, pages: 203 |
| REINHOLD SCHWALM: "UV Coatings: Basics, Recent Developments and New Application", 2007, ELSEVIER, pages: 115 |
| See also references of EP4617303A1 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4617303A4 (en) | 2026-03-25 |
| CN120077084A (zh) | 2025-05-30 |
| JP2026507987A (ja) | 2026-03-09 |
| EP4617303A1 (en) | 2025-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2022131836A1 (ko) | 고흡수성 수지의 제조 방법 | |
| WO2020145548A1 (ko) | 고흡수성 수지 및 이의 제조 방법 | |
| WO2022131838A1 (ko) | 고흡수성 수지 및 이의 제조 방법 | |
| WO2021125871A1 (ko) | 고흡수성 수지 조성물의 제조 방법 | |
| WO2022131835A1 (ko) | 고흡수성 수지의 제조 방법 | |
| WO2022055290A1 (ko) | 고흡수성 수지 및 이의 제조 방법 | |
| WO2021096230A1 (ko) | 고흡수성 수지 및 이의 제조방법 | |
| WO2022154566A1 (ko) | 고흡수성 수지의 제조 방법 | |
| WO2022131834A1 (ko) | 고흡수성 수지의 제조 방법 | |
| WO2022124767A1 (ko) | 고흡수성 수지의 제조 방법 | |
| WO2021071246A1 (ko) | 고흡수성 수지의 제조 방법 | |
| WO2020122444A1 (ko) | 고흡수성 수지의 제조 방법 | |
| WO2021125559A1 (ko) | 고흡수성 수지 조성물 | |
| WO2015084060A1 (ko) | 고흡수성 수지 및 이의 제조방법 | |
| WO2024172530A1 (ko) | 고흡수성 수지 및 이의 제조 방법 | |
| WO2024111948A1 (ko) | 고흡수성 수지 및 이의 제조방법 | |
| WO2024186083A1 (ko) | 고흡수성 수지 제조용 단량체 조성물 | |
| WO2021066338A1 (ko) | 고흡수성 수지 및 이의 제조 방법 | |
| WO2023121125A1 (ko) | 고흡수성 수지 조성물 및 이의 제조 방법 | |
| WO2023191392A1 (ko) | 고흡수성 수지 조성물 및 이의 제조 방법 | |
| WO2024128471A1 (ko) | 고흡수성 수지의 제조 방법 | |
| WO2022154631A1 (ko) | 고흡수성 수지의 제조 방법 | |
| WO2025071089A1 (ko) | 고흡수성 수지 및 이의 제조 방법 | |
| WO2026095548A1 (ko) | 흡수성 수지 및 이의 제조방법 | |
| WO2024106836A1 (ko) | 고흡수성 수지의 제조 방법 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 24757251 Country of ref document: EP Kind code of ref document: A1 |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 202480004485.3 Country of ref document: CN |
|
| ENP | Entry into the national phase |
Ref document number: 2025523953 Country of ref document: JP Kind code of ref document: A |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2025523953 Country of ref document: JP |
|
| WWP | Wipo information: published in national office |
Ref document number: 202480004485.3 Country of ref document: CN |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2024757251 Country of ref document: EP |
|
| ENP | Entry into the national phase |
Ref document number: 2024757251 Country of ref document: EP Effective date: 20250613 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| WWP | Wipo information: published in national office |
Ref document number: 2024757251 Country of ref document: EP |