WO2019143020A1 - 고흡수성 수지 및 이의 제조 방법 - Google Patents
고흡수성 수지 및 이의 제조 방법 Download PDFInfo
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- WO2019143020A1 WO2019143020A1 PCT/KR2018/015429 KR2018015429W WO2019143020A1 WO 2019143020 A1 WO2019143020 A1 WO 2019143020A1 KR 2018015429 W KR2018015429 W KR 2018015429W WO 2019143020 A1 WO2019143020 A1 WO 2019143020A1
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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
- 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
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- 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
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/04—Acids, Metal salts or ammonium salts thereof
- C08F20/06—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
- C08J3/02—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
-
- 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
- C08J2205/00—Foams characterised by their properties
- C08J2205/02—Foams characterised by their properties the finished foam itself being a gel or a gel being temporarily formed when processing the foamable composition
- C08J2205/022—Hydrogel, i.e. a gel containing an aqueous composition
-
- 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
- C08J2333/04—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
- C08J2333/08—Homopolymers or copolymers of acrylic acid esters
-
- 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
- C08J2333/04—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
- C08J2333/10—Homopolymers or copolymers of methacrylic acid esters
Definitions
- the present invention relates to a superabsorbent resin and a method for producing the same.
- the present application claims the benefit of priority based on Korean Patent Application No. 10-2018-0007384, filed on January 19, 2018, and the entire contents of the Korean patent application are incorporated herein by reference.
- the present invention relates to a superabsorbent resin having a high water content and a method for producing the same.
- Super absorbent polymer A synthetic polymer material capable of absorbing moisture of about 500 to 1,000 times the weight of lanzai.
- SAM Super absorbent polymer
- Absorbency Material, and Absorbent Gel Material AGM
- the highly water-absorbent resin has begun to be put to practical use as a sanitary tool and is widely used for a variety of materials such as sanitary articles such as diapers for children, soil remediation agents for gardening, soil for civil engineering materials, sheets for seedling growing, have.
- the preparation of a superabsorbent resin by aqueous solution polymerization involves a thermal polymerization method in which the hydrogel polymer is polymerized while fracturing and cooling the functional gel polymer in a kneader equipped with several shafts and a method of polymerizing and drying simultaneously by irradiating a high- And the like are known.
- the superabsorbent resin is subjected to processes such as drying, pulverization, classification, and the like, It is made into a dry powder of a certain size.
- such a dry powder may electrostatically charge to cause problems in the process, and may cause clogging in a bag filter or the like in a process of manufacturing a superabsorbent resin or a subsequent process such as diaper manufacturing or processing. And crushing may occur during a pneumatic transfer process for a subsequent process, resulting in a problem of deterioration of physical properties.
- the present specification aims at providing a superabsorbent resin having a relatively high water content and a method of manufacturing the same.
- a method for producing a superabsorbent resin is provided. 2019/143020 1 »(: 1 ⁇ ⁇ 2018/015429
- a surface-treated facial paper comprising a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups polymerized and crosslinked by an internal cross-linking agent and having a surface cross-linked layer modified by a surface cross-linking agent;
- a method for producing a superabsorbent resin according to one aspect of the present invention comprises:
- the superabsorbent resin particles are dispersed in an aqueous medium at a relative humidity of 50% to less than 80%
- the superabsorbent resin according to one aspect of the present invention comprises:
- a surface-treated facial paper comprising a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups polymerized and crosslinked by an internal cross-linking agent and having a surface cross-linked layer modified by a surface cross-linking agent;
- the water content is 0.1 wt% to 10 wt%.
- the superabsorbent resin can be produced by the above-mentioned method. 2019/143020 1 > (1 ' / Table 1 # 2018/015429
- each layer or each of the layers is directly or elements if the element referred to as being formed on or ,, '''on "for 10 of each of the layers or elements Or other layers or elements may be additionally formed on the substrate, between the layers, on the substrate, or on the substrate.
- the present invention can be variously modified,
- the superabsorbent resin and its production method will be described in more detail according to a specific embodiment of the invention.
- the superabsorbent resin has been evaluated to have important properties such as water retention capacity, pressure absorption capacity and absorption rate. For this purpose, conventionally,
- the inventors of the present invention have found that after a general gel polymer formed by polymerization and internal crosslinking reaction is dried, crushed and classified, surface crosslinking proceeds, and then a specific step is added to a superabsorbent resin having a surface cross-
- the present inventors have completed the present invention in view of the fact that they have relatively high water content as compared with the superabsorbent resin and do not include agglomerates of fine particles and do not contain large sized aggregate particles.
- the term "polymer " or “polymer” means that the ethylenically unsaturated monomer is in a polymerized state and can cover all the moisture content range or particle diameter range.
- Polymers having a water content (moisture content) of about 40% by weight or more in the previous state can be referred to as hydrogel polymers.
- base resin "or" base resin powder " means that the polymer, i.e., hydrogel polymer, is dried and crushed into a dry powder form.
- a method for producing a superabsorbent resin according to one aspect of the present invention comprises:
- the superabsorbent resin particles are dispersed in an aqueous solution having a relative humidity of 50RH% or more and less than 80RH% 2019/143020 1 »(: 1 ⁇ ⁇ 2018/015429
- a monomer composition having an acidic group and including at least a part of the acidic group and neutralized with an ethylenically unsaturated monomer, a polymerization initiator, and an internal cross- To form a gel-like polymer.
- the ethylenically unsaturated monomer may have an acidic group and at least a part of the acidic group is neutralized.
- the monomer is partially neutralized with an alkali substance such as sodium hydroxide, potassium hydroxide, ammonium hydroxide or the like.
- the neutralization degree of the ethylenically unsaturated monomer may be 40 mol% to 95 mol%, or 40 mol% to 80 mol%, or 45 mol% to 75 mol%.
- the range of the degree of neutralization can be adjusted according to the final properties. However, if the degree of neutralization is too high, the neutralized monomer tends to be streaked, and polymerization may be difficult to proceed smoothly. On the other hand, if the degree of neutralization is too low, the absorption capacity of the polymer is greatly lowered, .
- the ethylenically unsaturated monomer includes at least one selected from the group consisting of acrylic acid, methacrylic acid, and monovalent metal salts, bivalent metal salts, ammonium salts, and organic amine salts thereof.
- the concentration of the ethylenically unsaturated monomer in the monomer composition may be appropriately controlled in consideration of the polymerization time and the reaction conditions, 20 wt% to about 90 wt%, or about 40 wt% to about 70 wt%. Such a concentration range may be advantageous in controlling the grinding efficiency of the subsequent process polymer, while eliminating the need to remove unreacted monomers after polymerization using the gel phenomenon that occurs in the polymerization of high concentration aqueous solutions. However, if the concentration of the monomer is excessively low, the yield of the superabsorbent resin may be lowered.
- the monomer composition may contain a polymerization initiator generally used in the production of a superabsorbent resin.
- a polymerization initiator a thermal polymerization initiator or a photopolymerization initiator may be used depending on the polymerization method.
- photo polymerization initiator examples include benzoin ether, dialkyl acetophenone, hydroxyl alkylketone, phenyl glyoxylate, benzyl Dimethyl ketal (Bmzyl
- acylphosphine Dimethyl Ketal, acyl phosphine, and alpha-aminoketone may be used.
- acylphosphine there is a commonly used lucyrin TPO, namely, 2,4,6-trimethyl-benzoyl-trimethylphosphine oxide (iodine-benzoyl- Can be used.
- lucyrin TPO 2,4,6-trimethyl-benzoyl-trimethylphosphine oxide
- photopolymerization initiators are disclosed in Reinhold Schwalm, UV Coatings: Basics, Recent Developments and New Application, Elsevier 2007, page 115, which is incorporated herein by reference.
- thermal polymerization initiator at least one compound selected from the group consisting of a persulfate-based initiator, an azo-based initiator, hydrogen peroxide, and ascorbic acid may be used.
- persulfate-based initiators include sodium persulfate (Na2S208), potassium persulfate (Potassium persulfate; K2S208), ammonium persulfate (Ammonium persulfate; (NH4) 2S208), and the like.
- Azo-based initiators include 2,2-azobis (2-amidinopropane) dihydrochloride, 2,2-azobis- (N, 2- azobis- (N, N-dimethylene) isobutyr amidine dihydrochloride), 2-
- Such a polymerization initiator may be added to the monomer composition at a concentration of about 0.001 wt% to 1 wt%. That is, when the concentration of the polymerization initiator is too low, the polymerization rate may become slow and the monomer remaining in the final product may be extracted in a large amount. Conversely, when the concentration of the polymerization initiator is excessively high, The physical properties of the resin may be deteriorated such that the content of the component for the water content becomes high and the pressure absorption ability becomes low, which is not preferable.
- the monomer composition includes an internal cross-linking agent for improving the physical properties of the resin by polymerization of the water-soluble ethylenically unsaturated monomer.
- the crosslinking agent is for crosslinking the hydrogel polymer, and is distinguished from a crosslinking agent (surface crosslinking agent) for crosslinking the surface of the hydrogel polymer.
- the internal crosslinking agent is not particularly limited as long as it enables introduction of crosslinking in the polymerization of the water-soluble ethylenically unsaturated monomer.
- the internal cross-linking agent may be selected from the group consisting of N, N'-methylenebisacrylamide, trimethylol propane tri (meth) acrylate, ethylene glycol di (meth) acrylate, polyethylene glycol di (meth) Acrylate, diethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, butanediol di ) Acrylate, triethylene glycol di (meth) acrylate, Triethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipentaerythritol pentaacrylate, glycerin tri ( meth )
- Such internal crosslinking agents may be used at from about 1,000 ppmw to about 10,000 ppmw based on the weight of the monomers, or may be added at a concentration of from about 0.0 () 1 wt% to about 1 wt% with respect to the monomer composition.
- 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. On the contrary, when the concentration of the internal cross-linking agent is too high, the absorption power of the resin is lowered, which may be undesirable as an absorber.
- the crosslinking polymerization of the monomer composition may be carried out in the presence of a foaming agent.
- the foaming agent may form pores by decomposition upon polymerization and crosslinking reaction of the above-mentioned 1.
- Non-limiting examples of the foaming agent include sodium bicarbonate, sodium carbonate, potassium bicarbonate, potassium carbonate, calcium bicarbonate, calcium carbonate (calcium carbonate), calcium carbonate bicarbonate, magnesium bicarbonate, magnesium carbonate, azodicarbonamide (ADCA), diniitosopentamethylene tetramine (DPT), p, p'- Benzene sulfonyl hydrazide, p-toluenesulfonyl hydrazide (TSH), sucrose stearate, p-toluidine sulfonyl hydrazide, At least one compound selected from the group consisting of sucrose palmitate, sucrose laurate, The can contain.
- the blowing agent is added to the monomer composition at about 1,000 to about 3,000 ppmw 2019/143020 1 »(: 1 ⁇ ⁇ 2018/015429
- the blowing agent is from about 1,00 ⁇ to the monomer composition) 111 ⁇ ⁇ above, or 1,103 ⁇ 4 ⁇ 11 or more, or 1,20 ⁇ 1) 111 ⁇ ⁇ more; And 3,000 5> 111 ⁇ ⁇ or less Or less, or 2,00
- the monomer composition may further contain additives such as a thickener, a plasticizer, a storage stabilizer, and an antioxidant, if necessary.
- Such a monomer composition can be prepared in the form of a solution in which a raw material such as the above-mentioned monomer, polymerization initiator, internal cross-linking agent, etc. is dissolved in a solvent.
- a raw material such as the above-mentioned monomer, polymerization initiator, internal cross-linking agent, etc.
- usable solvents may be used without limitation of the constitution as long as they can dissolve the above-mentioned raw materials.
- the solvent examples include 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
- a solvent such as acetone, methyl ethyl ketone, acetone, methyl amyl ketone, cyclohexanone, cyclopentanone, diethylene glycol monomethyl ether, diethylene glycol ethyl ether, toluene, xylenes, butyrolactone, carbitol, methyl cellosolve acetate , Outer-dimethylacetamide, or a mixture thereof.
- the formation of the hydrogel polymer through polymerization of the monomer composition can be carried out by a conventional polymerization method, and the process is not particularly limited.
- the polymerization method is divided into thermal polymerization and photopolymerization depending on the type of polymerization energy source.
- the polymerization may proceed in a reactor having a stirring axis such as a kneader
- it may proceed in a reactor equipped with a movable conveyor belt.
- the hydrogel polymer can be obtained by charging the monomer composition into a reactor such as a kneader equipped with a stirring shaft, supplying hot air thereto, or heating the reactor by heating.
- a reactor such as a kneader equipped with a stirring shaft, supplying hot air thereto, or heating the reactor by heating.
- the hydrogel polymer discharged to the reactor outlet depending on the shape of the stirring shaft provided in the reactor can be obtained as particles of several millimeters to several centimeters.
- the resulting hydrogel polymer is injected The concentration of the monomer composition, the rate of injection, and the like.
- a functional gel-like polymer having a particle size of about 2 mm to about 50 (usually a weight average) can be obtained.
- a hydrogel polymer in the form of a sheet can be obtained.
- the thickness of the sheet may vary depending on the concentration of the monomer composition to be injected and the injection rate. Usually, the thickness of the sheet is adjusted to about 0.5 cm to about 5 cm in order to ensure uniformity of the entire sheet, .
- the moisture content may be the weight of water in the total weight of the hydrogel polymer, minus the weight of the hydrogel polymer in dry state. Specifically, it can be defined as a value calculated by measuring the weight loss due to evaporation of water in the polymer in the process of raising the temperature of the polymer through infrared heating.
- the drying condition is a temperature rise from room temperature to about 18CTC
- the total drying time can be set to about 20 minutes, including about 5 minutes for the temperature rise step.
- the method of producing the superabsorbent resin includes a step of drying the hydrogel polymer formed through the above-described steps.
- a step of pulverizing (coarsely crushing) the hydrogel polymer may be further performed before the drying in order to increase the efficiency of the drying step.
- the pulverizers usable for the above-mentioned coarse grinding include a vertical pulverizer, a turbo cutter, a turbo grinder, a rotary cutter mill, Examples thereof include a cutter mill, a disc mill, a shred crusher, a crusher, a chopper, and a disc cutter.
- the coarse pulverization may be performed so that the diameter of the hydrogel polymer is about 2 mm to about 10 mm. That is, in order to increase the drying efficiency, the hydrogel polymer is preferably pulverized into particles of 10 mm or less.
- the hydrogel polymer is pulverized into about 2 or more particles.
- the crude gelatinization step when the crude gelatinization step is performed before the drying step of the hydrogel polymer, the polymer has a high water content, so that the polymer may stick to the surface of the pulverizer.
- the crude pulverization step may be carried out by adding steam, water, a surfactant, an anti-flocculation inhibitor of 0 to 1, And a sulfate-based initiators, azo initiators, hydrogen peroxide and ascorbic mountains as a thermal polymerization initiator, an epoxy-based crosslinking agent, diol ⁇ 01) flow cross-linking agent, two functional groups, or three cross-linking agent to the functional group or more acrylate functional groups, a hydroxyl group A crosslinking agent such as a compound having one functional group can be added.
- drying for the hydrogel polymer immediately after coarse pulverization or polymerization as described above is carried out at a temperature of from about 1201 to about 250 ° 0, or from about 150 ° to about 200 ° 0, or from about 160 ° to about 1801 ° (Where the temperature can be defined as the temperature of the thermal medium supplied for drying or the temperature inside the drying reactor comprising the thermal medium and the polymer in the drying process). That is, when the drying temperature is low and the drying time is long, the physical properties of the final resin may be deteriorated. To prevent this, the drying temperature is preferably about 1201 or more. Only the surface is dried, and the generation of fine powder may be increased in the pulverizing process to be described later, and the physical properties of the final resin may be lowered. To prevent this, the drying temperature is about 250 Or less.
- the drying time in the drying step is not particularly limited, but may be adjusted to about 20 minutes to about 90 minutes under the drying temperature in consideration of process efficiency and the like.
- the drying method of the drying step may be applied to the drying method of the hydrogel polymer as long as it can be used normally. Specifically, the drying step may be applied by hot air supply, infrared irradiation, microwave irradiation, ultraviolet irradiation, or the like.
- the polymer dried in this way may exhibit a water content of from about 0.1 wt% to about 10 wt%, preferably from about 0.1 wt% to about 5 wt%, more preferably from about 0.1 wt% to about 1 wt% .
- the pulverization step may be performed such that a step in the optimizing the surface area of the dried polymer, the particle size of the pulverized polymer to about 150 / zm about 850_, specifically greater than or equal to 1 150 Thyssen less than about 850pm.
- the pulverizer may be a conventional mill, such as a pin mill, a hammer mill, a screw mill, a roll mill, a disc mill, and a jog mill. have. Further, in order to manage the physical properties of the superabsorbent resin to be finally produced, the step of selectively classifying particles having a particle diameter of less than about 150 / M to about 850 < 1 > in the polymer particles obtained through the pulverization step have. Through the above-mentioned steps, the step of surface-crosslinking the pulverized polymer, that is, the base resin powder, with the surface cross-linking agent is carried out.
- the surface crosslinking is a step of inducing a crosslinking reaction on the surface of the pulverized polymer in the presence of a surface crosslinking agent to form a superabsorbent resin having improved physical properties. Through such surface crosslinking, a surface cross-linked layer is formed on the surface of the ground polymer particles.
- the surface modification may be carried out by a conventional method for increasing the cross-linking density of the surface of the polymer particles.
- the surface modification may be carried out by mixing a solution containing the surface cross-linking agent and the pulverized polymer and performing a cross-linking reaction.
- the surface cross-linking agent is a compound capable of reacting with the functional group of the polymer, and the composition is not particularly limited.
- Examples include, but are not limited to, alkylene carbonates having 3 to 10 carbon atoms, polyhydric alcohols having 2 to 10 carbon atoms, aminoalcohols having 1 to 10 carbon atoms, oxetane compounds having 2 to 10 carbon atoms, epoxy compounds having 2 to 10 carbon atoms, 2 to 10 2019/143020 1 »(: 1 ⁇ ⁇ 2018/015429
- alkylene carbonate compounds include 1,3-dioxolane-2-one, 4-methyl-1,3-dioxolane-2- -Dioxolan-2-one, 4,4-dimethyl-
- the surface cross-linking agent is an alkoxypolyalkylene glycol mono (meth) acrylate-based monomer including methoxypolyethylene glycol monomethacrylate (MPEGMAA) and the like; And acrylic acid and
- the amount of the surface cross-linking agent may be appropriately controlled according to the type of cross-linking agent, reaction conditions, etc., and preferably about 0.001 part by weight to about 5 parts by weight with respect to 100 parts by weight of the ground polymer.
- the surface cross-linking may not be performed properly, and the physical properties of the final resin may be deteriorated. On the contrary, when an excessive amount of the surface cross-linking agent is used, the absorption capacity of the resin may be lowered due to excessive surface cross-linking reaction, which is not preferable.
- water may be added additionally when the surface cross-linking agent is added.
- the addition of the surface cross-linking agent and the water in this way can induce even dispersion of the surface cross-linking agent and further optimize the penetration depth of the surface cross-linking agent to the polymer particles.
- the amount of water added with the surface cross-linking agent can be adjusted to about 0.5 parts by weight to about 10 parts by weight with respect to 100 parts by weight of the ground polymer.
- the surface cross-linking is carried out at about 18010 to about 250 companies 2019/143020 1 »(: 1 ⁇ 3 ⁇ 42018 / 015429
- the surface cross-linking density can be increased, which is preferable. More preferably, the surface crosslinking is at least about 1901: at most about 2401: at most about 230 About 220 Less than about 210 ° 0, or less than about 200.
- the superabsorbent resin in the form of dried fine powder may cause various problems, it is necessary to further increase the water content.
- the water content is increased by exposing the superabsorbent resin particles having the surface cross-linked layer formed thereon to relatively high humidity and temperature conditions for a predetermined time.
- the wetting step may be carried out in a range of from about 1 minute to about 15 minutes, preferably from about 1 minute to about 10 minutes, depending on the target moisture content range. If the exposure time is too short, it is difficult to increase the water content. If the exposure time is too long, there is a problem in the surface cross-linked layer of the super absorbent resin, and the property related to absorption may be deteriorated.
- the above-mentioned wetting step preferably has a relative humidity of not less than about 501111% and not more than about 751111%, more preferably not less than about 601111% And More than Or less.
- the high-shear water-based resin prepared according to the above-described production method can have excellent top water-related physical properties, and has a relatively high water content as compared with conventional superabsorbent resins, so that the problems caused by the super- Can be prevented.
- a superabsorbent resin according to one aspect of the present invention comprises:
- a surface-treated facial paper comprising a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups polymerized and crosslinked by an internal cross-linking agent and having a surface cross-linked layer modified by a surface cross-linking agent;
- the water content is 0.1 wt% to 10 wt%.
- the ethylenically unsaturated monomer may preferably be a compound represented by the following general formula (1) as described in the production method section.
- M 1 is a hydrogen atom, a monovalent or divalent metal, an ammonium group or an organic amine salt.
- the ethylenically unsaturated monomer includes at least one selected from the group consisting of acrylic acid, methacrylic acid, and monovalent metal salts, bivalent metal salts, ammonium salts, and organic amine salts thereof.
- the ethylenically unsaturated monomer may have an acidic group and at least a part of the acidic group may be neutralized. Preferably it can be used which is partially neutralized the monomers with alkali materials such as sodium hydroxide, potassium hydroxide, ammonium hydroxide.
- the neutralization degree of the ethylenically unsaturated monomer may be from about 40 mol% to about 95 mol%, alternatively from about 40 mol% to about 80 mol%, alternatively from about 45 mol% to about 75 mol% The range can be adjusted according to the final properties. However, if the degree of neutralization is too high, neutralized monomers may precipitate and polymerization may not be smoothly proceeded.
- the water content may vary depending on the purpose of use, which may vary depending on the control of the exposure conditions of the wetting step in the manufacturing process.
- the water content may be 0.1% by weight or more, preferably about 0.5% by weight or more, May be at least 1% by weight, and may be up to 10% by weight, preferably up to about 7% by weight, more preferably up to about 5% by weight.
- the superabsorbent resin according to one embodiment of the present invention may be 0.1% by weight or more, preferably about 0.5% by weight or more, May be at least 1% by weight, and may be up to 10% by weight, preferably up to about 7% by weight, more preferably up to about 5% by weight.
- the upper limit value of the complementary performance is not particularly limited, but may be about 50 or less, preferably about 40 or less, or about 35 or less, or about 30 or less.
- centrifugal separation performance (01 (:) is measured according to EDANA method 241.3 and can be expressed by the following equation (1)
- the superabsorbent resin may have a pressure absorbing capacity (show ⁇ ) of about 15 or more, preferably about 19 or more, or about 20 or more at 0.degree.
- the upper limit value is also not particularly limited, but may be about 40 or less, preferably about 30 or less, or about 1,1 or less, or about 25 or less.
- the solution was poured into a Vat-shaped tray (15 cm in width, 15 cm in length) equipped with a light irradiation device and placed inside a square polymerization reactor having its interior preheated at 80 ° C, and light irradiation was performed to initiate light irradiation. After about 25 seconds from light irradiation, the gel was observed from the surface, and after about 50 seconds polymerization was confirmed to occur at the same time as the foaming, and a water gel polymer in the form of a sheet was obtained by further reaction for 3 minutes.
- the hydrogel polymer of the sheet form obtained in the step 1 was cut into a size of 3 cm in width and 3 cm in length and then the functional gel was pushed to a perforated plate having a plurality of holes by using a screw type extruder mounted inside a cylindrical crusher Followed by chopping.
- the pulverized hydrogel polymer was then dried in a drier capable of airflow transfer up and down.
- the hot gel of 180 ° C was flowed from below to the top for 15 minutes so that the water content of the dried powder was about 2% or less, and then flowed from the upper side to the lower side again for 15 minutes to homogenize the hydrogel polymer Lt; / RTI >
- 100 parts by weight of the base resin was mixed with 4 parts by weight of water, 1 part by weight of ethylene carbonate, 1 part by weight of inorganic material (having a size of 10 or less in diameter, Having
- a base resin was prepared in the same manner as in Preparation Example 1, and then 1 part by weight of ethylene carbonate, 1 part by weight of propylene carbonate, 4.5 parts by weight of water, an inorganic material (having a diameter of 200 to 380 / Si02 ) were mixed and subjected to a surface cross-linking reaction at 190 DEG C for 50 minutes. The resultant product was cooled and classified to obtain surface-crosslinked superabsorbent resin particles having a particle size of 150 to 850_.
- a base resin was prepared in the same manner as in Preparation Example 1, and 1 part by weight of ethylene carbonate, 1 part by weight of propylene carbonate, 5 parts by weight of water, 0.1 part by weight of Si02 ) were mixed and subjected to surface cross-linking reaction at 190 DEG C for 50 minutes. Then, the obtained product was cooled and classified to obtain a superabsorbent resin particle having a surface cross-linked with a particle size of 150 to 850 / pore.
- the superabsorbent resin having a higher water content was re-classified to select an aggregate having a diameter of 850_ or more, and the content () of the aggregate per 100 g of the superabsorbent water was measured.
- the measurement of water storage capacity was based on EDANA method WSP 241.3. 0.2 g of the prepared superabsorbent resin sample is placed in a tea bag and precipitated in a 0.9% aqueous salt solution for 30 minutes. Then, dehydration was performed for 3 minutes with a centrifugal force of 250G (gravity), and the amount of the saline solution was measured.
- AUP pressure absorption capacity
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Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
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| US16/962,947 US12435191B2 (en) | 2018-01-19 | 2018-12-06 | Super absorbent polymer and method for preparing same |
| CN201880085690.1A CN111655763B (zh) | 2018-01-19 | 2018-12-06 | 超吸收性聚合物及其制备方法 |
| JP2020539220A JP7062868B2 (ja) | 2018-01-19 | 2018-12-06 | 高吸水性樹脂およびその製造方法 |
| EP18901340.2A EP3722351B1 (en) | 2018-01-19 | 2018-12-06 | Method for preparing a super absorbent polymer |
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| KR10-2018-0007384 | 2018-01-19 | ||
| KR1020180007384A KR102555380B1 (ko) | 2018-01-19 | 2018-01-19 | 고흡수성 수지 및 이의 제조 방법 |
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| EP (1) | EP3722351B1 (ko) |
| JP (1) | JP7062868B2 (ko) |
| KR (1) | KR102555380B1 (ko) |
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| US11613591B2 (en) | 2019-09-18 | 2023-03-28 | Lg Chem, Ltd. | Method for preparing super absorbent polymer |
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| KR102752740B1 (ko) * | 2019-09-27 | 2025-01-08 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법 |
| KR102671013B1 (ko) * | 2019-11-05 | 2024-05-30 | 주식회사 엘지화학 | 고흡수성 수지의 제조 방법 |
| US12600849B2 (en) | 2020-03-23 | 2026-04-14 | Lg Chem, Ltd. | Super absorbent polymer film and preparation method thereof |
| EP4074764B1 (en) | 2020-03-23 | 2025-10-15 | Lg Chem, Ltd. | Preparation method for super absorbent polymer film |
| KR102888753B1 (ko) * | 2022-07-12 | 2025-11-21 | 주식회사 엘지화학 | 고흡수성 수지 복합체의 제조방법 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11613591B2 (en) | 2019-09-18 | 2023-03-28 | Lg Chem, Ltd. | Method for preparing super absorbent polymer |
| US12264211B2 (en) | 2019-09-18 | 2025-04-01 | Lg Chem, Ltd. | Method for preparing super absorbent polymer |
Also Published As
| Publication number | Publication date |
|---|---|
| US12435191B2 (en) | 2025-10-07 |
| EP3722351A4 (en) | 2021-01-06 |
| EP3722351A1 (en) | 2020-10-14 |
| US20210179790A1 (en) | 2021-06-17 |
| CN111655763B (zh) | 2023-07-28 |
| KR20190088830A (ko) | 2019-07-29 |
| EP3722351B1 (en) | 2025-06-18 |
| WO2019143020A8 (ko) | 2019-08-22 |
| JP2021511408A (ja) | 2021-05-06 |
| KR102555380B1 (ko) | 2023-07-12 |
| JP7062868B2 (ja) | 2022-05-09 |
| CN111655763A (zh) | 2020-09-11 |
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