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  • C08F20/00—Homopolymers and 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
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  • C08F20/00—Homopolymers and 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
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  • B01J2220/00—Aspects relating to sorbent materials
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  • C08J2205/00—Foams characterised by their properties
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  • 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
  • C08J2333/04—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 esters
  • C08J2333/06—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 esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
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  • C08J2333/04—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 esters
  • C08J2333/06—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 esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
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Definitions

• the present invention can swell at high speed upon contact with water and has mechanical properties such as high gel strength in the swollen state. It relates to a manufacturing method for providing a porous superabsorbent resin which exhibits excellent physical properties with improved water retention capacity (CRC) and pressure absorption capacity (AUP).
• CRC water retention capacity
• AUP pressure absorption capacity
• Super Absorbent Polymer is a synthetic polymer that has the ability to absorb about 500 times 1,000 times its own weight. Each developer has a different designation, such as SAMCSLiper Absorbency Mater Al, and AGM (Absorbent Gel Mater Al).
• SAMCSLiper Absorbency Mater Al and AGM (Absorbent Gel Mater Al).
• AGM Absorbent Gel Mater Al
• these superabsorbent polymers are widely used in the field of sanitary products such as diapers and sanitary napkins.
• the superabsorbent polymers need to exhibit high absorption of moisture and must not escape moisture absorbed by external pressure. In addition to this. It is necessary to maintain good shape even in the state of volume expansion (swelling) by absorbing water to show excellent permeabi li ty. "Then, Te, and the high and the beam SAT (CRC) property showing a basic absorption and water holding capacity of the water absorbent resin, the pressure indicative of a characteristic that a well holding the absorbed water in the external pressure and water absorption capacity (AUP) is to be difficult to improve with Known.
• CRC beam SAT
• the present invention has the mechanical properties such as high gel strength, beam SAT (CRC) and a pressure absorption capacity (AUP) is together in the subject to swell rapidly upon contact with water and swollen state; improved excellent properties It is to provide a manufacturing method for providing the porous super absorbent polymer shown.
• the neutralizing liquid neutralized 80 mol% or more of the water-soluble ethylenically unsaturated monomer having an acidic group
• adding a crosslinking agent, an initiator, an inorganic filler and a non-ionic surfactant to form a monomer neutralizing solution; High shear mixing the monomer neutralizing solution; Forming a hydrogel polymer from the high shear mixed monomer neutralizing solution through thermal polymerization or photopolymerization; And drying, pulverizing and classifying the hydrogel polymer to form a base resin powder.
• a method for preparing a porous superabsorbent polymer is provided.
• (meth) acrylate [(meth) acrylate] is meant to include both acrylate (methryl ate) and methacrylate (methacryl ate).
• a monomer neutralization liquid by adding an internal crosslinking agent, an initiator, an inorganic filler and a nonionic surfactant to the neutralizing solution neutralized at least 80 mol% water-soluble ethylenically unsaturated monomer having an acidic group ; High shear mixing the monomer neutralizing solution; Forming a hydrogel polymer from the high shear mixed monomer neutralizing solution through thermal or photopolymerization; And drying, pulverizing and classifying the hydrogel polymer to form a base resin powder.
• a method of preparing a porous superabsorbent polymer may be provided.
• the inventor stone By adding a nonionic surfactant together with an internal crosslinking agent and neutralizing the water-soluble ethylenically unsaturated monomer having an acidic ⁇ 7 ⁇ with an internal crosslinking agent and performing high shear mixing, the polymerization reaction is carried out. The experiment confirmed that it can provide a porous super absorbent polymer according to the invention and completed the invention.
• the prepared porous superabsorbent polymer may swell at high speed when contacted with water, and in the swelled state, it is possible to implement an excellent water phase having improved water retention capacity (CRC) and pressure absorption capacity (AUP) together.
• CRC water retention capacity
• AUP pressure absorption capacity
• the prepared porous superabsorbent polymer includes a first crosslinked polymer in which the water-soluble ethylenically unsaturated monomer is crosslinked and polymerized, and the first crosslinked polymer has a plurality of fine pores, and the fine pores are connected to each other to form a capillary tube. Since the channel can be formed, it can be swollen at a relatively high speed as compared with the superabsorbent polymers known in the past.
• the prepared superabsorbent polymer may include a first crosslinked polymer in which the water-soluble ethylenically unsaturated monomer is crosslinked and polymerized, and the first crosslinked polymer is in the range of 2,000, or 10, 2,000 / m, or micropores having a diameter of 50 to 500 mm 3 can be formed.
• the non-aqueous surfactant is more uniform. So that the via-neutral surfactant may be distributed homogeneously throughout the hydrogel polymer before or during the hydrogel polymer polymerization process, and the size and shape of the pores during the polymerization of silver All pores can be properly maintained, and the fine pores can be uniformly distributed over the entire area in the porous superabsorbent polymer to be produced. ⁇
• the method of preparing the superabsorbent polymer may further include adding a basic compound to a water-soluble ethylenically unsaturated monomer having an acidic group to form a neutralized solution neutralized at least 80 mol%.
• the neutralization degree of the water-soluble ethylenically unsaturated monomer which has the said acidic group can be calculated and confirmed from the molar ratio of the hydroxyl column of the said basic compound with respect to the acidic group of the water-soluble ethylenically unsaturated monomer which has the acidic group used.
• Examples of the basic compound used in the neutralization are not particularly limited, but sodium hydroxide, potassium hydroxide or calcium hydroxide may be used in consideration of the stability of the neutralizing solution.
• examples of the device that can be used in the high shear mixing of the monomer neutralizing solution include beads mil, microfludizer, fill mixer, planetary dispersive mixer. (planetary dispersive mixer), mechanical mixer (homogenizer) and the like.
• the high shear mixing of the monomer neutralizing solution may be performed in an amount of 1,000 to 20,000 . and mixing at a speed of rpni.
• the time of performing the step of high shear mixing the monomer neutralizing solution may be performed for a time of 1 minute to 100 minutes. It had the monomer increases hwaaek "high shear common running time of the summing can be too short, not enough mixing said monomer neutralized haekah 3 ⁇ 4, also the pores and porosity to be produced forming pores in the water-absorbent resin may not be sufficiently formed. If the execution time of the high-molecular mixing step of the monomer neutralization solution is too long, the drying phenomenon of the mixed solution may appear or the polymerization phenomenon may appear and the physical properties of the porous superabsorbent polymer to be finally produced may be lowered.
• the non-neutral surfactant allows the voids to be stably maintained in a homogeneously distributed state throughout the monomer neutralization liquid.
• a plurality of fine pores may be formed in the first crosslinked polymer in which the water-soluble ethylenically unsaturated monomer is crosslinked and polymerized.
• the nonionic surfactant has a structure of open-typre micropores of the fine pores, thereby enabling formation of the capillary channel described above.
• the non-ionic surfactant is a porous superabsorbent polymer of final production It may be used in an appropriate amount in consideration of specific uses or physical properties, for example, the non-neutral surfactant may be used in 0.1 to 5 parts by weight relative to 100 parts by weight of the water-soluble ethylenically unsaturated monomer having the acidic group.
• nonionic surfactant a conventionally known nonionic surfactant may be used.
• specific examples of the nonionic surfactant include alkylene glycol (for example, alkylene glycol having 1 to 30 carbon atoms), polyethylene glycol, poly (ethylene-propylene) glycol, polyvinyl alcohol, polyoxyethylene alkyl ether, fatty acid. Sorbitan ester, fatty acid diethanolamine, alkyl monoglyceryl ether, or a mixture of two or more thereof.
• nonionic surfactant compounds sold under the trade names Tr i ton X, Pluroni c, and Tween may be used.
• water-soluble ethylenically unsaturated monomers examples include acrylic acid, methacrylic acid, maleic anhydride, fumaric acid, crotonic acid, itaconic acid, 2-acryloylethane sulfonic acid, and 2-methacryloylethanesulfonic acid, 2- (meth).
• alkali metal salts such as acrylic acid or salts thereof, for example, acrylic acid and / or sodium salts of which at least a portion of acrylic acid is neutralized may be used, and the preparation of superabsorbent polymers having superior physical properties using such monomers may be used.
• the alkali metal salt of acrylic acid is used as a monomer, the acrylic acid is neutralized with a basic compound such as caustic soda (NaOH).
• a basic compound such as caustic soda (NaOH).
• CaOH caustic soda
• any internal crosslinking agent having a crosslinkable functional group which has been conventionally used for the production of a super absorbent polymer, can be used without particular limitation. .
• a polyfunctional acrylate compound having a plurality of ethylene oxide groups may be used as an internal crosslinking agent in order to introduce an appropriate crosslinking structure into the first crosslinked polymer and the base resin powder to further improve the physical properties of the superabsorbent polymer.
• Such internal crosslinking agents include polyethylene glycol diacrylate (PEGDA), glycerin diacrylate, glycerin triacrylate unmodified or ethoxylated trimethylol triacrylate (TMPT / 0 : nucleic acid diol diacrylate and tri And at least one selected from the group consisting of ethylene glycol diacrylates.
• PEGDA polyethylene glycol diacrylate
• TMPT / 0 glycerin triacrylate unmodified or ethoxylated trimethylol triacrylate
• TMPT / 0 nucleic acid diol diacrylate
• inorganic filler which can be used for the said monomer neutralization liquid is not limited, A crosslinking bond, an oxygen containing bond (-0-), or a. It is preferable to use inorganic particles chemically bonded to the first crosslinked polymer via a nitrogen-containing bond (-NR-; R is hydrogen or an alkyl group having 1 to 3 carbon atoms or an amino bond).
• crosslinks derived from these functional groups e.g., crosslinks derived from (meth) acrylate-based functional groups, allyl groups or crosslinkable functional groups of vinyl groups
• oxygen-containing bonds or nitrogen-containing bonds e.g., epoxy groups
• the inorganic particles are chemically bonded to the polymer chains of the first crosslinked polymer (eg, covalently to crosslinked) through an ether bond, an amine bond or an amide bond derived from a hydrophilic functional group of a hydroxy group, an isocyanate group or an amine group. Combined).
• the first crosslinked polymer and the base resin powder have a double crosslinked structure formed through an internal crosslinking agent and surface-modified inorganic particles, the overall excellent physical properties as described above (especially, at the same time improved water retention performance) And absorbency under pressure).
• silica nanoparticles or alumina nanoparticles surface-modified with the aforementioned hydrophilic or crosslinkable functional groups may be used.
• the inorganic particles may be surface-modified with a crosslinkable or hydrophilic functional group including at least one functional group selected from the group consisting of (meth) acrylate-based functional group, allyl group, vinyl group, epoxy group, hydroxy group, isocyanate group and amine group,
• the inorganic particles are silicas surface-modified with a crosslinkable or hydrophilic functional group including at least one functional group selected from the group consisting of (meth) acrylate-based functional groups, allyl groups, vinyl groups, epoxy groups, hydroxy groups, isocyanate groups, and amine groups.
• the crosslinkable or hydrophilic functional group is the aforementioned (meth) acrylate ⁇ functional group. It may include at least one or more functional groups selected from the group consisting of allyl?, Vinyl group, epoxy group, hydroxy group, isocyanate group, amine group. Specifically, the crosslinkable or hydrophilic functional group has 2 to 4 carbon atoms including at least one functional group selected from the group consisting of (meth) acrylate-based functional groups, allyl groups, vinyl groups, epoxy groups, hydroxy groups, isocyanate groups, and amine groups. 20 substituents.
• inorganic particles may be chemically bonded to the first crosslinked polymer through a crosslinking bond, an oxygen-containing bond (-0-), or a nitrogen-containing bond, and an inorganic material surface-modified with the hydrophilic or crosslinkable functional group.
• the crosslinking, oxygen-containing bond (-0-) or nitrogen-containing bond may be formed through reaction between the particles and the first crosslinked polymer.
• the inorganic filler may vary in content depending on the shape and properties of the porous superabsorbent polymer to be finally prepared, and may be used as an inorganic filler 0.01 to 10 parts by weight based on 100 parts by weight of the water-soluble ethylenically unsaturated monomer in the monomer neutralization liquid. have.
• the content of the water-soluble ethylenically unsaturated monomer in the monomer neutralization liquid is
• black may be about 40 to about 50% by weight, and may be in an appropriate concentration in consideration of polymerization time and reaction conditions.
• concentration of the monomer is too low, the yield of superabsorbent polymer may be low and there may be a problem in economics.
• concentration is too high, some of the monomer may precipitate or the grinding efficiency may be low when the polymerized hydrogel polymer is pulverized. Problems may occur and the properties of the superabsorbent polymer may be degraded.
• the monomer neutralization liquid may further include a thermal polymerization initiator or a photopolymerization initiator
• the monomer composition may further include a polymerization initiator generally used for preparing a super absorbent polymer.
• the polymerization initiator may use a thermal polymerization initiator or a photopolymerization initiator according to UV irradiation depending on the polymerization method.
• a thermal polymerization initiator may be included.
• the photopolymerization initiator may be used without any limitation as long as it is a compound capable of forming radicals by light such as ultraviolet rays.
• Benzoin ether dialkyl acetophenone, hydroxy 1 alkylketone, phenylglyoxylate, benzyl dimethyl ketal.
• One or more selected from the group consisting of acyl phosphine and alpha-aminoketone may be used.
• acylphosphine a commercially available lucirin TP0, that is, 2,4,6-trimethyl-benzoyl-trimethyl phosphine oxide (2,4,6-trimethyl-benzoyl-trimethyl phosphine oxide) may be used.
• Re i nho 1 d Schwa lm 2,4,6-trimethyl-benzoyl-trimethyl phosphine oxide
• the photopolymerization initiator may be included in a concentration of about 0.01% to about 1.0% by weight based on the monomer composition. If the concentration of the photopolymerization initiator is too low, the polymerization rate may be slow. If the concentration of the photopolymerization initiator is too high, the molecular weight of the superabsorbent polymer may be low and the physical properties may be uneven. It is also possible to use the thermal polymerization initiator include a persulfate-based initiator, an azo-based initiator, "at least one selected from hydrogen peroxide and ascorbic acid initiator group consisting of.
• persulfate-based initiators include sodium persulfate (Na 2 S 2 0 8 ), potassium persulfate (K2S208), ammonium persulfate (NH 4 ) 2 S 2 0 8
• azo initiators include 2, 2-azobis- (2-amidinopropane) dihydrochloride (2.
• 2-azob is (2-am idi nopr opane) dihydrochlor ide), 2 , 2—azobis _ (N, N dimethylene) isobutyramimidine dihydrochloride (2,2-azobis— (N, N- di met hy 1 ene) isobutyr ami dine dihydrochlor ide), 2- (kava Moyl azo) isobutyronitrile (2- (carbamoylazo) isobutylonitril), 2,2- azobis [2- (2-imidazolin-2-yl) propane] dihydrochloride (2,2— azobis [2— (2-imidazol in-2-yi) propane] dihydrochlor ide), 4,4 azobis-::.
• the thermal polymerization initiator may be included in a concentration of about 0.001 to about 0.5% by weight based on the monomer composition.
• concentration of the thermal polymerization initiator is too low, additional thermal polymerization hardly occurs, and the effect of the addition of the thermal polymerization initiator may be insignificant.
• concentration of the thermal polymerization initiator is too high, the molecular weight of the superabsorbent polymer may be low and the physical properties may be uneven. have.
• the type of the internal crosslinking agent included in the monomer composition is already described above, and the internal crosslinking agent is included at a concentration of about 0.01 to about 0.5% by weight based on the monomer composition to crosslink the polymerized polymer. Can be.
• the internal crosslinking agent is used in about 0.3 parts by weight or more, or about 0.3 to 6 parts by weight relative to 100 parts by weight of the monomer, for example, acrylic acid in the unneutralized state, the physical properties of the above-described embodiment Superabsorbent resins that more suitably meet can be produced.
• the monomer composition may further include additives such as thickeners, plasticizers, storage stabilizers, antioxidants, and the like, as necessary.
• Raw materials such as photopolymerization initiators, thermal polymerization initiators, internal crosslinking agents and additives may be prepared in the form of a monomer composition solution dissolved in a solvent.
• the solvent that can be used at this time can be used without limitation of the composition as long as it can dissolve the above-mentioned components, for example, 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, cyclonucleanone, cyclopentanone, diethylene glycol monomethyl ether, diethylene glycol Ethyl ether, toluene, xylene, butyrolactone, carby, methyl cellosolve acetate, and one or more selected from ⁇ , ⁇ -dimethylacetamide and the like can be used in combination.
• the solvent may be included in the remaining amount of the above-described components with respect to the total content of the monomer composition.
• thermal polymerization may be performed in a semi-unggi machine having a stirring shaft, such as a kneader
• photopolymerization may be performed in a semi-unggi machine equipped with a movable conveyor belt. It is an example, and this invention is not limited to the polymerization method mentioned above.
• the hydrogel polymer obtained by thermal polymerization by supplying hot air to a reactor such as a kneader having a stirring shaft or by heating a semi-ungpun is according to the shape of the stirring shaft provided in the reaction vessel.
• the hydrogel polymer discharged to the outlet may be in the form of several centimeters to several millimeters.
• the size of the resulting hydrogel polymer may vary depending on the concentration and the injection speed of the monomer composition to be injected, and a hydrogel polymer having a weight average particle diameter of about 2 to 50 mm can be obtained.
• the form of the hydrous gel polymer is usually obtained It may be a hydrogel polymer on a sheet with the width of the belt.
• the thickness of the polymer sheet depends on the concentration and the injection speed of the monomer composition to be injected, but it is usually preferable to supply the monomer composition so that a polymer on the sheet having a thickness of about 0.5 to about 5 cm can be obtained.
• the water content of the hydrogel polymer obtained by the above method may be about 40 to about 80% by weight.
• the term "water content” as used throughout the specification means the value of the water content to the total weight of the water-containing gel polymer minus the weight of the polymer in the dry state.
• through infrared heating in the process of drying the temperature of the polymer by drying, the weight loss according to the moisture evaporation of the polymer f is measured and defined as a calculated value. At this time, the drying conditions are raised to about 180 ° C at room temperature and maintained at 180 ° C. The total drying time is set to 20 minutes, including 5 minutes of the silver rising step, and the moisture content is measured.
• the base resin powder may be obtained through drying, pulverization, and classification. Through the pulverization and classification, the base resin powder and the super absorbent polymer obtained therefrom are manufactured and provided to have a particle size of about 150 to 850. This is appropriate. More specifically, at least about 95% by weight or more of the base resin powder and the super absorbent polymer obtained therefrom will have a particle size of about 150 to 850 / ⁇ , and the fine powder having a particle size of less than about 150 ⁇ will be less than about 3% by weight. Can be.
• the final manufactured super absorbent polymer may exhibit the above-described physical properties and better liquid permeability.
• the pulverizer used is not limited in configuration, specifically, a vertical pulverizer, a turbo cutter, a turbo grinder, a rotary cutter mill, a cutting machine Includes any one selected from the group of grinding machines consisting of cutter mills, disc mills, shred crushers, crushers, choppers and disc cutters Although it is possible, it is not limited to the above-mentioned example.
• the coarse grinding step may be pulverized so that the particle size of the hydrogel polymer is about 2 to about 10mm.
• drying is performed on the hydrogel polymer immediately after polymerization which is coarsely pulverized or not subjected to the coarsely pulverized step.
• the drying temperature of the drying step may be about 150 to about 250 ° C. If the drying temperature is less than about 150 ° C, the drying time may be too long and the physical properties of the final superabsorbent polymer may be lowered. If the drying temperature exceeds about 250 ° C, only the polymer surface is dried excessively. Fine powder may generate
• the drying may proceed at a temperature of about 150 to about 200 ° C, more preferably at a silver degree of about 160 to about 180 ° C.
• drying time in consideration of process efficiency, etc., about 20 to about
• drying step is also commonly used as a drying step of the hydrogel polymer, can be selected and used without limitation of the configuration. Specifically, the drying step may be performed by hot air supply, infrared irradiation, microwave irradiation, or ultraviolet irradiation.
• the water content of the polymer after such a drying step may be about 0.1 to about 10% by weight.
• the polymer powder obtained after the grinding step may have a particle diameter of about 150 to about 850 /.
• the grinder used to grind to such a particle diameter is specifically a pin mill, hammer mill, screw mill 11, mill mill, disc mill or A jog mill or the like may be used, but is not limited to the example described above.
• a separate process of classifying the polymer powder obtained after grinding according to the particle size may be subjected.
• the polymer having a particle size of about 150 to about 850 kPa is classified, and only a polymer powder having such a particle size can be manufactured through the ' surface crosslinking reaction step. Since the particle size distribution of the base resin powder obtained through this process has already been described above, further detailed description thereof will be omitted.
• the method of preparing the porous superabsorbent polymer may further include forming a surface crosslinked worm by further crosslinking the surface of the Y resin powder in the presence of a surface crosslinking agent. That is, after advancing the formation process of the base resin powder mentioned above, in the presence of a surface crosslinking agent.
• the surface of the base resin powder may be further crosslinked to form a surface crosslinked layer.
• the surface crosslinking agent for forming the surface crosslinking layer formed on the base resin powder and the second crosslinked polymer included therein all of the surface crosslinking agents conventionally used in the production of superabsorbent polymers may be used without particular limitation.
• More specific examples thereof include ethylene glycol, 1,4-butanediol, 1,6-nucleic acid diol, and propylene glycol.
• the surface crosslinking structure of the superabsorbent polymer can be further optimized as the surface crosslinking is performed by adding a polyvalent metal cation together with the surface crosslinking agent. This is expected because this metal cation can further reduce the crosslinking distance by forming a chelate with the carboxyl group (C00H) of the superabsorbent resin.
• the structure is not limited about the method of adding the said surface crosslinking agent to a base resin powder.
• a method of mixing the surface crosslinking agent and the base resin powder in a reaction tank, or spraying the surface crosslinking agent on the base resin powder, and a method of continuously supplying and mixing the base resin powder and the surface crosslinking agent to a mixer which is operated continuously. can be used.
• water and methane may be added in combination together.
• the addition of water and methane has the advantage that the surface crosslinker can be evenly dispersed in the base resin powder.
• the content of water and methanol is added to 100 parts by weight of the base resin powder for the purpose of inducing even dispersion of the surface crosslinking agent, preventing aggregation of the base resin powder and optimizing the surface penetration depth of the crosslinking agent. to which can be applied to adjust.
• the surface-crosslinking agent By heating for at least about 20 minutes at least about 1.60 ° C it to the surface-crosslinking agent is added to the base resin powder may be formed of a surface cross-linking reaction.
• the surface cross-linking process conditions are at a maximum reaction temperature of about 180 to 200 ° C., holding time at a maximum reaction temperature of about 20 minutes or more, The black may be in a condition of about 20 minutes or more and 1 hour or less.
• the temperature rise time until the maximum reaction temperature is about 10 minutes or more, black is about It was confirmed that the superabsorbent polymer can be controlled to 10 minutes or more and 1 hour or less, and satisfactorily meets the physical properties of the embodiment by meeting the surface crosslinking process conditions described above.
• the temperature raising means for surface crosslinking reaction is not specifically limited. It can be heated by supplying a heat medium or by directly supplying a heat source. At this time, available As the type of heat medium, a heated fluid such as steam, hot air, or hot oil may be used, but the present invention is not limited thereto. In addition, the temperature of the heat medium to be supplied may be appropriately selected in consideration of the means of heating medium, the rate of temperature increase, and the gain. Can be. On the other hand, the heat source directly supplied may be a heating method through electricity, a gas heating method, but is not limited to the above examples.
• the superabsorbent polymer obtained according to the above-described manufacturing method can exhibit very excellent properties improved with various physical properties such as water-retaining capacity and pressure-absorbing capacity, and can exhibit excellent general properties that can be suitably used for hygiene products such as diapers.
• the superabsorbent polymer prepared above has a centrifugal water retention capacity (CRC) of about 20 to 40 g / g for physiological saline and a pressure absorption capacity (AUP) of 0.7 ps i to physiological saline about 15 to 35 g. / g can be.
• CRC centrifugal water retention capacity
• AUP pressure absorption capacity
• the centrifugal water retention capacity (CRC) for physiological saline can be measured according to the method of the EDANA method WSP 241.2. More specifically, the upper limb 11 can be calculated by the following formula 1 after absorbing the superabsorbent resin in physiological saline over 30 minutes:
• W 0 ( ' g) is the initial weight of the super absorbent polymer (g)
• (g) is the weight of the device measured after dehydration at 250G for 3 minutes using a centrifuge without using a super absorbent polymer
• ( g ) Is the device weight including the superabsorbent polymer after immersion in the 0.9% by weight of physiological saline in immersion for 30 minutes and then dehydrated at 250G for 3 minutes using a centrifuge. .
• the pressure absorption capacity (AUP) of 0.7 ps i can be measured according to the method of the EDANA method WSP 242.2. More specifically, the pressure-absorbing capacity may be calculated according to the following formula 2 after absorbing the superabsorbent polymer in physiological saline under a pressure of about 0.7 ps i over 1 hour:
• AUP (g / g) [W 4 (g)-W 3 (g)] / W 0 (g)
• W 0 (g) is the initial weight (g) of the super absorbent polymer
• W 3 (g) is the sum of the weight of the super absorbent polymer and the weight of the device capable of applying a load to the super absorbent polymer
• W 4 (g) is determined after absorption of physiological saline into the superabsorbent polymer for 1 hour under load (0.7 psi). It is the sum of the weight of the superabsorbent polymer and the weight of the device capable of applying a load to the superabsorbent polymer.
• W 0 (g) described in Formulas 1 to 2 corresponds to an initial weight (g) before absorbing the superabsorbent polymer in physiological saline, and may be the same or different.
• the gel strength can be measured as the horizontal gel strength G 'according to the following method described in Patent Application No. 2014-01653514.
• the horizontal gel strength G ' can be measured by absorbing physiological saline in the superabsorbent resin for 1 hour and then using a commercialized rheometer in a method comprising the following angles:
• the superabsorbent resins of one embodiment may have a liquid permeability (SFC) under pressure of about 0.3 psi to physiological saline of about 10 ⁇ 10 ⁇ 7 cm 3 * sec / g or more.
• SFC liquid permeability
• the superabsorbent polymer of the above-described embodiment is about 150 to 850 It may have a particle shape such as spherical or amorphous having a particle diameter.
• a manufacturing method for providing a super absorbent polymer may be provided.
• the superabsorbent polymer of the present invention fundamentally solves the problems of the existing superabsorbent polymers and the technical demands of the art, and may exhibit more excellent physical properties, and can be very preferably applied to various sanitary products.
• FIG. 1 is a SEM photograph of the porous ' super absorbent polymer of Example 1; .
• Fig. 2 shows a SEM photograph of the porous super absorbent polymer of Example 12: .
• Figure 3 shows a SEM photograph of the porous super absorbent polymer of Comparative Example 2.
• Example 1
• the aqueous monomer solution was prepared using a mechanical cal mixer. High shear mixing was performed for approximately 60 minutes at a speed of 5,000 rpm.
• kneading was carried out with 810 g of the high shear mixed monomer neutralization solution first, followed by polymerization in a continuous polymerization with 30.54 g of 0.18% ascorbic acid solution and 33 g of 1% sodium persulfate solution and 30.45 g of 0.15% hydrogen peroxide solution.
• the polymerization was carried out by feeding through a feeder of a possible reactor. The temperature of the polymerizer
• the dried hydrogel polymer was divided into a pin mill grinder '. Then, a sieve was used to classify the polymer having a mip diameter of less than about 150 /, and a polymer having a particle size of about 150 m to 850.
• a porous superabsorbent polymer of Example 2 was prepared in the same manner as in Example 1, except that [poly (ethylene oxide) (propylene oxide) (ethylene oxide) 3 block copolymer] was used.
• Comparative Example 35 Comparative Example 35.83 g of acrylic acid, 43.54 g of caustic soda (NaOH, 30% by weight solution) and 7.76 g of water were combined to form a neutralized nucleus in which 70 mol% of the acrylic acid was neutralized.
• Polyethyleneglycol diacrylate (Mw 400) ⁇ , ⁇ and hydroxy group as a crosslinking agent in the neutralizing agent and silica particles (30% by weight in aqueous solution, particle size 12 ⁇ ) with a colloidal silica having a specific surface area of 200niVg Present) 0.71 g was added to prepare a monomer aqueous solution having a monomer concentration of 50% by weight.
• the monomer aqueous solution was subjected to high shear mixing for about 60 minutes at a speed of 5,000 rpm using a mechanical mixer.
• kneading was carried out with 810 g of the high shear mixed monomer neutralization solution first, followed by polymerization in a continuous polymerization with 30.54 g of 0.18% ascorbic acid solution and 33 g of 1% sodium persulfate solution and 30.45 g of 0.15% hydrogen peroxide solution.
• the supply part of the polymerizable polymer can be put through the polymerization.
• the temperature of the polymerization reactor was maintained at 80 0 C, the maximum temperature of the polymerization is 110 ° C, polymerization time is 1 minutes 15 seconds.
• kneading was continued, and polymerization and kneading were performed for 20 minutes.
• the size of the resulting polymerizer was then distributed below 0.2 cm. At this time, the final .
• the water content of the hydrogel polymer formed was 51% by weight yeotdi i.
• the prepared surface resin powder was sprayed with a surface treatment solution containing 5 wt% of 1,3—propanediol and 5 wt% of propylene glycol, and stirred at room temperature, whereby the surface treatment solution was uniformly distributed in the base resin powder. Thereafter, a sieve was used to obtain a superabsorbent polymer having a particle size of about 150 to 850. The content of fine powder having a particle diameter of about 150 ⁇ ⁇ or less in the product of the porous super absorbent polymer was less than about 2% by weight.
• Comparative Example 2 35.83 g of acrylic acid, 43.54 g of caustic soda (NaOH, 30 weight solution) and 7.76 g of water were mixed to obtain a neutralized nucleus with about 70 mole% of the acrylic acid being mixed in the same manner as in Example 1. A water absorbent resin was obtained.
• Test Example 2 35.83 g of acrylic acid, 43.54 g of caustic soda (NaOH, 30 weight solution) and 7.76 g of water were mixed to obtain a neutralized nucleus with about 70 mole% of the acrylic acid being mixed in the same manner as in Example 1. A water absorbent resin was obtained.
• EDANA WSP 241 .2 In accordance with the European Di sposables and Nonwovens Associ at ion (EDANA) standard EDANA WSP 241 .2 was measured, that is, the resin of examples and Comparative examples W 0 (g, about 0.2g) put uniformly on the envelope of the non-woven fabric sealed (seal) one after, phase saline solution is a sodium chloride solution of 0.9 wt% in Flooded in. After 30 minutes, the envelope was centrifuged and drained at 250 G for 3 minutes, and then the mass W 2 (g) of the envelope was measured. Moreover, the mass Wg) at that time was measured after performing the same operation without using resin. Using each mass thus obtained, CRC (g / g) was calculated according to the following equation 1 to confirm the water holding capacity.
• W 0 (g) is the initial weight (g) of the superabsorbent polymer
• Kg is the device weight measured after dehydration at 250 G for 3 minutes using a centrifuge without using a super absorbent polymer
• W 2 (g) is obtained by submerging the superabsorbent polymer in water at 0.9% by weight in physiological saline for 30 minutes and then dehydrating it at 250 G for 3 minutes using a centrifuge. to be.
• Examples 1 and 2 prepared from the monomer neutralization liquid formed by neutralizing at least 80 mol% of the water-soluble ethylenically unsaturated monomer having an acidic group and adding a non-neutral surfactant, fine pores are uniformly distributed. Porous superabsorbent resin is provided.
• the porous super absorbent polymers prepared in Examples 1 and 2 not only have excellent physical properties such as water-retaining capacity and water absorption capacity, It is confirmed that there is a property that can swell at high speed upon contact with water. This seems to be due to the fine pores uniformly formed inside the porous superabsorbent polymers of Examples 1 and 2 connected to each other to form a capillary channel, thereby quickly hopping the water present in the outside and expanding in a short time. .
• the pores present in the porous superabsorbent polymer of 2 also significantly increase the specific surface area where water can diffuse, thereby greatly increasing the swelling rate.

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