KR20150117902A - Super absorbent polymer and method for preparing the same - Google Patents
Super absorbent polymer and method for preparing the same Download PDFInfo
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- KR20150117902A KR20150117902A KR1020140043640A KR20140043640A KR20150117902A KR 20150117902 A KR20150117902 A KR 20150117902A KR 1020140043640 A KR1020140043640 A KR 1020140043640A KR 20140043640 A KR20140043640 A KR 20140043640A KR 20150117902 A KR20150117902 A KR 20150117902A
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- 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
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- 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
- C08F6/00—Post-polymerisation treatments
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- 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
- C08F6/00—Post-polymerisation treatments
- C08F6/008—Treatment of solid polymer wetted by water or organic solvents, e.g. coagulum, filter cakes
-
- 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
- C08F8/00—Chemical modification by after-treatment
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- 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
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- 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
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- 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
- C08J3/12—Powdering or granulating
- C08J3/126—Polymer particles coated by polymer, e.g. core shell structures
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- 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
Abstract
Description
The present invention relates to a superabsorbent resin and a method for producing the same.
Super Absorbent Polymer (SAP) is a synthetic polymer material capable of absorbing about 500 to 1,000 times its own weight of moisture. Super SAM (Super Absorbent Material), AGM (Absorbent Gel Material) And so on. The above-mentioned superabsorbent resin has started to be put into practical use as a sanitary article, and nowadays, in addition to sanitary articles such as diapers for children, there are now various kinds of sanitary articles such as soil repair agents for horticultural use, index materials for civil engineering and construction, sheets for seedling, It is widely used as a material for articles and the like.
As a method of producing such a superabsorbent resin, there are known methods such as reversed-phase suspension polymerization or aqueous solution polymerization. The reversed-phase suspension polymerization is disclosed in, for example, Japanese Unexamined Patent Publication No. 56-161408, Unexamined Japanese Patent Application No. 57-158209, and Japanese Unexamined Patent Publication No. 57-198714. As a method of aqueous solution polymerization, there are known a thermal polymerization method in which heat is applied to an aqueous solution and a photopolymerization method in which ultraviolet light is irradiated to perform polymerization.
One embodiment of the present invention is to provide a method of manufacturing a superabsorbent resin capable of increasing productivity by reducing the amount of fine powder generated during the production of a superabsorbent resin.
One embodiment of the present invention seeks to provide a superabsorbent resin having improved water repellency (CRC) and pressure absorption capacity (AUP) and reduced water soluble component (EC).
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of manufacturing the same.
A method of manufacturing a superabsorbent resin according to an embodiment of the present invention includes:
Polymerizing a monomer composition comprising a hydrophilic monomer; Controlling the content of water contained in the polymer to 10% or more to 15% or less by drying the polymer; . ≪ / RTI >
In the above production method, the content of water contained in the polymer before the drying may be in the range of 50% or more to 60% or less.
As an example of the drying step, the polymer may be dried for 10 minutes to 30 minutes or less with hot air within a range of 170 ° C or higher and 200 ° C or lower.
As another example of the drying step, the polymer may be dried for 15 minutes to 30 minutes or less with hot air within a range of 170 DEG C or higher to 190 DEG C or lower.
The manufacturing method may further include a first pulverizing step of pulverizing the polymer before the drying step.
The manufacturing method may further include, after the drying step, a second pulverizing step of pulverizing the polymer.
The manufacturing method may further include a surface cross-linking step. The surface cross-linking step may include a step of mixing the surface cross-linking agent and the polymer after the drying step and drying the mixture in a range of not less than 170 ° C. and not more than 190 ° C. for not less than 30 minutes and not more than 120 minutes have.
The superabsorbent resin according to one embodiment of the present invention is characterized in that the analytical value of the pressure absorption capacity (AUP) analyzed according to the EDANA WSP242.2.R3 method is in the range of 20 g / g or more to 40 g / g or less, The analytical value of the aqueous component (EC) analyzed according to WSP270.2.R3 method may be less than 12%.
In addition, the superabsorbent resin was analyzed by EDANA WSP241.2.R3 method The analytical value of water retention capacity (CRC) may be in the range of 30 g / g or more and 50 g / g or less.
The superabsorbent resin may include superabsorbent resin particles having a diameter of 150 mu m or more and 850 mu m or less.
The method of manufacturing a superabsorbent resin according to an embodiment of the present invention can reduce the amount of fine powder generated in the drying step of the superabsorbent resin.
The method of producing a superabsorbent resin according to an embodiment of the present invention can provide a superabsorbent resin with improved pressure absorption ability because the surface cross-linking time can be kept long.
The superabsorbent resin according to one embodiment of the present invention can provide a superabsorbent resin having improved physical properties and pressure absorption ability and reduced amount of aqueous solution components and having excellent physical properties.
Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described in detail below. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.
Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another.
Method for producing superabsorbent resin
The method of producing a superabsorbent resin according to an embodiment of the present invention may include polymerizing a monomer composition comprising a hydrophilic monomer.
The hydrophilic monomer can be used without limitation as long as it is a monomer generally used in the production of a superabsorbent resin. The hydrophilic monomer may be understood as a monomer including a hydrophilic group, for example, a hydroxyl group (-OH group), a carboxyl group (-COOH group), an amide group (-NH 2 group)
The hydrophilic monomer may be, for example, a water-soluble ethylenically unsaturated monomer, and the water-soluble ethylenically unsaturated monomer mainly includes an anionic monomer and a salt thereof, a nonionic hydrophilic monomer containing an amino group, and an unsaturated monomer containing an amino group, One or more selected from the group consisting of
In an exemplary embodiment, at least one selected from the group consisting of acrylic acid, methacrylic acid, maleic anhydride, fumaric acid, crotonic acid, itaconic acid, 2- acryloylethanesulfonic acid, 2- methacryloylethanesulfonic acid, 2- (meth) acryloylpropanesulfonic acid And at least one anionic monomer selected from the group consisting of 2- (meth) acrylamide-2-methylpropanesulfonic acid or a salt thereof; (Meth) acrylamide, N-substituted (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, methoxypolyethylene glycol Methacrylate; and at least one nonionic hydrophilic-containing monomer selected from the group consisting of (meth) acrylate; Or an unsaturated monomer containing at least one amino group selected from the group consisting of (N, N) -dimethylaminoethyl (meth) acrylate and (N, N) -dimethylaminopropyl (meth) can do.
The concentration of the water-soluble ethylenically unsaturated monomer in the monomer composition may vary depending on the polymerization time and the reaction conditions such as the feed rate of the monomer composition, the heat and / or light irradiation time, the irradiation range and the irradiation intensity, the belt width, And in the exemplary embodiment, it may be in the range of 40 wt% or more to 60 wt% or less. In this case, it may be efficient in terms of the solubility and economy of the monomer.
The monomer composition may further include at least one additive selected from the group consisting of a photopolymerization initiator, a thermal polymerization initiator and a crosslinking agent. The polymerization initiator can be appropriately selected and used depending on whether thermal polymerization, photopolymerization, or thermal polymerization and photopolymerization are selected during the process.
Examples of the photopolymerization initiator include, but are not limited to, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 4- (2-hydroxyethoxy) phenyl- -Hydroxy) -2-propyl ketone, 1-hydroxycyclohexyl phenyl ketone, and other acetophenone derivatives; Benzoin alkyl ether compounds such as benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether and benzoin isobutyl ether; benzophenone derivatives such as methyl o-benzoylbenzoate, 4-phenylbenzophenone, 4-benzoyl-4'-methyl-diphenyl sulfide and (4-benzoylbenzyl) trimethylammonium chloride; Thioxanthone-based compounds; Acylphosphine oxide derivatives such as bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide and diphenyl (2,4,6-trimethylbenzoyl) -phosphine oxide; Or an azo group such as 2-hydroxymethylpropionitrile, 2,2 '- (azobis (2-methyl-N- (1,1'-bis (hydroxymethyl) -2- hydroxyethyl) propionamide) And the like can be used alone or in combination of two or more, but the present invention is not limited thereto.
The thermal polymerization initiator is not particularly limited. For example, azo (azo) initiator, peroxide initiator, redox initiator or organic halide initiator may be used alone or in combination of two or more thereof . The thermal polymerization initiator may include, but is not limited to, sodium persulfate (Na 2 S 2 O 8 ) or potassium persulfate (K 2 S 2 O 8 ).
In the monomer composition, the photopolymerization initiator and the thermal polymerization initiator can be selected and used as long as they can exhibit polymerization initiating effect. In an exemplary embodiment, the photopolymerization initiator may be contained in an amount of 0.005 parts by weight to 0.1 parts by weight, based on 100 parts by weight of the monomer, and the thermal polymerization initiator may be contained in an amount of 0.01 part by weight to 0.5 parts by weight But the present invention is not limited thereto.
The cross-linking agent may be a cross-linking agent containing at least one functional group and at least one ethylenic unsaturated group capable of reacting with the substituent of the monomer, or a cross-linking agent containing at least two functional groups capable of reacting with a substituent of the monomer and / or a substituent formed by hydrolysis of the monomer Crosslinking agents may be used.
In an exemplary embodiment, the crosslinking agent is selected from the group consisting of bisacrylamide having 8 to 12 carbon atoms, bismethacrylamide having 8 to 12 carbon atoms, poly (meth) acrylate of polyol having 2 to 10 carbon atoms, or poly (Meth) acrylate. Specific examples thereof include N, N'-methylenebis (meth) acrylate, ethyleneoxy (meth) acrylate, polyethyleneoxy Or a mixture of two or more thereof, such as glycerin diacrylate, glycerin triacrylate, trimethylol triacrylate, triallyl amine, triaryl cyanurate, triallyl isocyanate, polyethylene glycol, diethylene glycol, propylene glycol However, the present invention is not limited to these.
In the monomer composition, the content of the crosslinking agent can be selected as long as it can exhibit a crosslinking effect. In an exemplary embodiment, the crosslinking agent may be included in an amount of not less than 0.01 parts by weight and not more than 0.5 parts by weight based on 100 parts by weight of the monomer, but is not limited thereto.
The polymer as a result of the polymerization step may contain at least 30% water. The content of the water contained therein is not particularly limited, but may be, for example, 50% or more to 60% or less. Hereinafter, as described in detail, the method for producing a superabsorbent resin according to an embodiment of the present invention may further include a first pulverization step of first pulverizing the polymer before the following drying step. At this time, the content of water contained in the polymer can minimize the generation of fine powder due to pulverization.
The method for producing a superabsorbent resin according to an embodiment of the present invention may include drying the polymer. Through the drying step, the content of water contained in the polymer can be controlled in the range of 10% or more to 15% or less.
For convenience of explanation, the content of the water contained therein can be defined as a moisture content. If the water content is less than 10%, it is not preferable since a part of the polymer may be hydrolyzed to increase the content of the water-soluble component (EC). In addition, when the water content is less than 10%, fine powder may be generated in the pulverization step of the polymer. Such a fine powder may cause a decrease in productivity. If the moisture content is less than 10%, a part of the polymer may be hydrolyzed to increase the water-soluble component (EC) in the drying step and the high-temperature surface crosslinking step described later.
On the other hand, when the moisture content is more than 15%, the pulverization of the polymer is not smoothly carried out in the pulverization step to be described later, and as shown in the following experimental results, the water retention capacity and the pressure absorption capacity may be deteriorated.
Therefore, the range of the water content to improve both the productivity of the production of the superabsorbent resin and the physical properties of the superabsorbent resin may be from 10% or more to 15% or less.
As the drying method, usually a dryer and a heating furnace can be used. In an exemplary embodiment, a hot air drier, a fluidized bed drier, an air stream drier, an infrared drier, a dielectric heating drier, and the like can be used, but the present invention is not limited thereto.
The drying step may be performed at a temperature ranging from 170 ° C or higher to 200 ° C or lower such that the moisture content is 10% or higher to 15% or lower. Specifically, the polymer can be dried with hot air within a range of 170 ° C or higher and 200 ° C or lower. More specifically, the drying step may be performed in a range of 10 minutes to 30 minutes by hot air within a range of 170 ° C or higher and 200 ° C or lower.
The drying step may be performed at a temperature ranging from 170 ° C or higher to 190 ° C or lower such that the moisture content is 10% or higher to 15% or lower. Specifically, the polymer can be dried with hot air within a range of 170 ° C or higher and 190 ° C or lower. More specifically, the drying step may be carried out in a range of not less than 15 minutes and not more than 30 minutes by hot air within a range of 170 DEG C or more and 190 DEG C or less.
The method for producing a superabsorbent resin according to an embodiment of the present invention may further include the step of firstly pulverizing the polymer before the drying step. The primary pulverization step may increase the specific surface area of the polymer to reduce the drying time of the polymer. As described above, since the polymer before the drying step contains water within a predetermined range, generation of fine powder in the first pulverization step can be minimized.
The method for producing a superabsorbent resin according to an embodiment of the present invention may further comprise a second pulverization step of secondarily pulverizing the polymer after the drying step. Through the second pulverization step, the polymer can be made into particles having a predetermined size.
The pulverizing method is not particularly limited, but for example, a device for cutting and extruding a rubber-like elastic material can be used. In an exemplary embodiment, a cutter-type cutter, a chopper-type cutter, a kneader-type cutter, a vibration type crusher, an impact type crusher, a friction type crusher, and the like are exemplified.
Although the size of the particles is not particularly limited, for example, the size of the particles may be from 1 탆 or more to less than 1000 탆.
After the second pulverization step, a step of separating the particles according to the size may be further performed. Although not particularly limited, the sorting can be performed by using a sieve to select particles having a size of less than 150 μm, particles having a size of 150 μm or more and 850 μm or less, and particles having a size of 850 μm or more.
The method for producing a superabsorbent resin according to an embodiment of the present invention may further include a surface crosslinking step of mixing the surface crosslinking agent and the polymer after the drying step and drying the mixture.
For example, the surface cross-linking step can dry the mixture of the surface cross-linking agent and the polymer in a range of not less than 170 ° C. and not more than 190 ° C. in a range of not less than 30 minutes and not more than 120 minutes.
The surface cross-linking agent may be a compound known in the superabsorbent resin industry prior to the filing date of the present application, for example, 1,4-butanediol, ethylene glycol diglycidyl ether, water, methanol ethanol and the like. However, the present invention is not limited thereto.
The surface cross-linking can be carried out, for example, after the particles having a predetermined size are produced through a drying and pulverizing step. However, the surface cross-linking is not limited to this and may be carried out several times as required.
The superabsorbent resin according to one embodiment of the present invention can be produced using the above-described production method. The superabsorbent resin according to one embodiment of the present invention is characterized in that the analytical value of the pressure absorption capacity (AUP) analyzed according to the EDANA WSP242.2.R3 method is in the range of 20 g / g or more to 40 g / g or less, and EDANA WSP270.2 The analytical value of the aqueous component (EC) analyzed according to the R 3 method may be less than 12%. In addition, the superabsorbent resin according to one embodiment of the present invention is analyzed by EDANA WSP241.2.R3 method The analytical value of water retention capacity (CRC) may be within the range of 30 g / g or more and 50 g / g or less.
The superabsorbent resin according to one embodiment of the present invention may include superabsorbent resin particles having a diameter of 150 mu m or more and 850 mu m or less. The absorption capacity, water-soluble component, and water-repellency performance may be, but not limited to, particles having a size of 150 μm or more and 850 μm or less. It can be seen from the following Examples and Comparative Examples that the superabsorbent resin according to one embodiment of the present invention has excellent physical properties as compared with Comparative Examples.
≪ Example 1 >
The SAP gel containing 55% moisture was pulverized using a Meat chopper and dried in a 170 ° C hot air dryer for 30 minutes. The dried polymer was cooled to room temperature in a desiccator and then pulverized using a cutting mill. The pulverized polymer was sieved with a mesh to separate into smaller sizes of 150 탆, 150 탆 or larger and 850 탆 or smaller and 850 탆 or larger. The loss on drying measured by heating the particles at 150 占 퐉 or more to 850 占 퐉 or less at 150 占 폚 for 30 minutes was 13.7%. 80 g of a mixed solution obtained by mixing 1,4-butanediol: methanol: water in a ratio of 1: 9: 10 was mixed with 1 kg of particles having a particle size of not less than 150 μm and not more than 850 μm selected as described above. The mixture was thoroughly stirred for 30 minutes or more, And dried.
≪ Example 2 >
The SAP gel containing 55% moisture was pulverized using a Meat chopper and then dried in a 190 ° C hot air drier for 15 minutes. The dried polymer was cooled to room temperature in a desiccator and then pulverized using a cutting mill. The pulverized polymer was sieved into a net and was separated into smaller sizes of less than 150 mu m, not less than 150 mu m and not more than 850 mu m, and more than 850 mu m. The weight loss of the particles measured by heating the particles at 150 캜 or more and 150 캜 for 30 minutes was 12.5%. 80 g of a mixed solution of 1,4-butanediol: methanol: water in a ratio of 1: 9: 10 was mixed with 1 kg of particles having a particle size of not less than 150 탆 and not more than 850 탆 selected as described above. The mixture was thoroughly stirred for 30 minutes or more, Lt; / RTI >
≪ Comparative Example 1 &
The SAP gel containing 55% moisture was pulverized using a Meat chopper and dried in a 180 ° C hot air dryer for 2 hours. The dried polymer was cooled to room temperature in a desiccator and then pulverized using a cutting mill. The pulverized polymer was sieved into a net and was separated into smaller sizes of less than 150 mu m, not less than 150 mu m and not more than 850 mu m, and more than 850 mu m. The weight loss of the dried particles measured by heating the particles at 150 캜 or more and 150 캜 for 30 minutes was 4.2%. 80 g of a mixed solution of 1,4-butanediol: methanol: water in a ratio of 1: 9: 10 was mixed with 1 kg of particles having a particle size of not less than 150 μm and not more than 850 μm selected as described above, Lt; / RTI >
≪ Comparative Example 2 &
The SAP gel containing 55% moisture was pulverized using a Meat chopper and then dried in a hot air drier at 150 ° C for 30 minutes. The dried polymer was cooled to room temperature in a desiccator and then pulverized using a cutting mill. The pulverized polymer was sieved into a net and was separated into smaller sizes of less than 150 mu m, not less than 150 mu m and not more than 850 mu m, and more than 850 mu m. The weight loss of the dried particles measured by heating the particles at 150 占 폚 to 850 占 퐉 for 30 minutes at 150 占 폚 was 17.2%. 80 g of a mixture prepared by mixing 1,4-butanediol: methanol: water at a ratio of 1: 9: 10 was mixed with 1 kg of particles having a particle size of not less than 150 μm and not more than 850 μm selected as described above, Lt; / RTI >
<Experimental Example>
The superabsorbent resin particles of Examples 1 and 2 and Comparative Examples 1 and 2 were sieved to take only particles having a particle size of 150 mu m or more and 850 mu m or less. Referring to the following Table 1, particles having a particle size of 150 μm or more and 850 μm or less were selected as 84.5% in Comparative Example 1, 78.6% in Comparative Example 2, 89.3% in Example 1, and 89.5% in Example 2. (CRC), pressure absorption capacity (AUP) and water soluble component (EC) analysis were performed on these particles. The Centrifuge Retention Capacity (CRC), Absorbency Under Pressure (AUP), and Extractable Content (EC) analysis are based on EDANA (European Disposables and Nonwovens Association) WSP241.2.R3, EDANA WSP242.2.R3 and EDANA WSP270.2.R3 methods. Respectively. The results are shown in Table 2 below.
In Comparative Example 1, since the drying time was too long, a large amount of fine powder was generated in the milling step, and the EC of the product after surface crosslinking was high. In Comparative Example 2, the drying temperature was too low to perform the milling process smoothly, and the CRC was low. In Examples 1 and 2, fewer fine powders were produced in the milling process, and after surface cross-linking, the product had a low EC and a high AUP.
While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.
Claims (10)
Controlling the content of water contained in the polymer to 10% or more to 15% or less by drying the polymer;
Absorbent resin.
Wherein the content of water contained in the polymer before drying is in a range of 50% or more to 60% or less.
Wherein the polymer is dried in hot air within a range of 170 DEG C or higher and 200 DEG C or lower for 10 minutes to 30 minutes or less.
Wherein the polymer is dried in hot air within a range of 170 占 폚 or higher to 190 占 폚 or lower for 15 minutes to 30 minutes or less.
Further comprising the step of pulverizing the polymer before the drying step.
Further comprising the step of pulverizing the polymer after the drying step.
Further comprising a surface cross-linking step after said drying step,
Wherein the surface cross-linking step comprises mixing the surface cross-linking agent and the polymer and drying the mixture in a range of from 170 DEG C or higher to 190 DEG C or lower in a range of from 30 minutes to 120 minutes or less.
Analyzed according to EDANA WSP241.2.R3 method Wherein the analytical value of water retention capacity (CRC) is in the range of 30 g / g or more to 50 g / g or less.
And a superabsorbent resin particle comprising superabsorbent resin particles having a diameter of 150 mu m or more and 850 mu m or less.
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| PCT/KR2015/003362 WO2015156545A1 (en) | 2014-04-11 | 2015-04-03 | Super-absorbent polymer and method for producing same |
| TW104111619A TW201603838A (en) | 2014-04-11 | 2015-04-10 | Super absorbent polymer and method of preparing the same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20160038670A (en) * | 2014-12-08 | 2016-04-07 | 한국다이퍼 주식회사 | Method of fabricating of perishable SAP |
| US11046819B2 (en) | 2016-12-13 | 2021-06-29 | Lg Chem, Ltd. | Super absorbent polymer and method for producing same |
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| KR101317815B1 (en) * | 2010-06-16 | 2013-10-15 | 주식회사 엘지화학 | Preparation method of super absorbent polymer |
| KR101495779B1 (en) * | 2010-11-30 | 2015-02-25 | 주식회사 엘지화학 | Preparation method of super absorbent polymer |
| KR101461174B1 (en) * | 2011-10-10 | 2014-11-13 | 주식회사 엘지화학 | Preparation method of super absorbent polymer |
| KR101447656B1 (en) * | 2012-04-25 | 2014-10-07 | 주식회사 엘지화학 | Super absorbent polymer and preparation method thereof |
| KR20140036866A (en) * | 2012-09-18 | 2014-03-26 | 주식회사 엘지화학 | Preparation method for super absorbent polymer |
-
2014
- 2014-04-11 KR KR1020140043640A patent/KR20150117902A/en not_active Application Discontinuation
-
2015
- 2015-04-03 WO PCT/KR2015/003362 patent/WO2015156545A1/en active Application Filing
- 2015-04-10 TW TW104111619A patent/TW201603838A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160038670A (en) * | 2014-12-08 | 2016-04-07 | 한국다이퍼 주식회사 | Method of fabricating of perishable SAP |
| US11046819B2 (en) | 2016-12-13 | 2021-06-29 | Lg Chem, Ltd. | Super absorbent polymer and method for producing same |
| US11845837B2 (en) | 2016-12-13 | 2023-12-19 | Lg Chem, Ltd. | Super absorbent polymer |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015156545A1 (en) | 2015-10-15 |
| TW201603838A (en) | 2016-02-01 |
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