WO1997019968A1 - Procede de production de resine absorbant l'eau - Google Patents
Procede de production de resine absorbant l'eau Download PDFInfo
- Publication number
- WO1997019968A1 WO1997019968A1 PCT/JP1996/003454 JP9603454W WO9719968A1 WO 1997019968 A1 WO1997019968 A1 WO 1997019968A1 JP 9603454 W JP9603454 W JP 9603454W WO 9719968 A1 WO9719968 A1 WO 9719968A1
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- WIPO (PCT)
- Prior art keywords
- water
- absorbent resin
- ethylenically unsaturated
- unsaturated monomer
- soluble ethylenically
- Prior art date
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Classifications
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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
- C08F291/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds according to more than one of the groups C08F251/00 - C08F289/00
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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
- C08F2/00—Processes of polymerisation
- C08F2/32—Polymerisation in water-in-oil emulsions
-
- 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
- C08F2/00—Processes of polymerisation
- C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
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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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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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
- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
- C08F265/02—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of acids, salts or anhydrides
Definitions
- the present invention relates to a method for producing a water-absorbent resin, particularly to a method for producing a water-absorbent resin by polymerizing a water-soluble ethylenically unsaturated monomer.
- Water-absorbent resins are used in a wide range of fields, such as sanitary products such as sanitary products and disposable diapers, agricultural and horticultural applications such as water retention agents and soil conditioners, and industrial materials applications such as water stoppage agents and anti-condensation agents. . Of these, water-absorbent resins are being actively used, especially in the area of sanitary materials.
- the water-absorbing resin used in these various applications is generally a lightly crosslinked high molecular resin such as a starch-acrylonitrile copolymer copolymer hydrolyzate (JP-B-49).
- Starch-acrylic acid graft copolymers and starch-based water-absorbing fats such as neutralized products of starch-acrylic acid graft copolymers (Japanese Patent Application Laid-Open No. 51-128468) Saponified copolymer (JP-A-52-14689) and partially neutralized polyacrylic acid (JP-A-62-2006, JP-A-57-158209) And Japanese Patent Application Laid-Open No. 57-214405).
- the properties required for a water-absorbent resin, especially a water-absorbent resin used for sanitary materials are that the water absorption is large and the water absorption speed is high, the gel strength after water absorption is high, and the fine powder is small and the particle size distribution is low. It is narrow.
- the water absorption rate is determined by the properties required for such a water-absorbent body when it is combined with pulp material in sanitary materials and other applications, that is, the water absorption of the absorbed liquid (liquid to be absorbed). This is an important factor that affects the small amount of reversion to the outside of the body and enhances the diffusivity of the absorbed liquid inside the water absorber.
- the diffusivity of the liquid to be absorbed into the water-absorbing body is good.
- the pressure is applied to the water absorbing body (for example, when the baby in a diaper using the water absorbing body sits immediately after urinating)
- the liquid to be absorbed is reversed.
- the return amount increases. If the supply rate of the liquid to be absorbed to the water absorbing body is higher than the water absorbing rate of the water absorbent resin, excess liquid to be absorbed may leak from the water absorbing body.
- the water-absorbent resin locally absorbs the liquid-absorbed liquid near the supply position of the liquid to be absorbed to the water-absorbent body,
- the swollen water-absorbent resin often gels and causes blocking.
- the diffusibility of the liquid to be absorbed into the water absorbent is hindered by the gelled water-absorbent resin, and the liquid to be absorbed becomes difficult to spread throughout the water absorbent. The amount of reversal increases.
- a water-absorbing resin that has a high initial water absorption rate and thereafter can change to a gentle water absorption rate.
- a water-absorbent resin capable of exhibiting, but r water absorption rate is high water absorbent resin and the water absorption rate is considered a mixture of a slow water-absorbing resin, such water-absorbent resin, Since it is prepared by mixing a plurality of types of water-absorbing resins having different particle diameters and bulk specific gravities, it lacks uniformity and has not been able to solve the above-mentioned problems.
- An object of the present invention is to reduce the amount of the water-absorbing resin that is to be absorbed and to increase the diffusivity of the liquid to be absorbed at the same time.
- an object of the present invention is to reduce the amount of reversible liquid to be absorbed, and at the same time to enhance the diffusibility of the liquid to be absorbed, particularly for a water-absorbent resin used for sanitary materials. Disclosure of the invention
- the method for producing a water-absorbent resin according to the present invention comprises the steps of: This is for producing a water-absorbent resin by a polymerization reaction of a monomer. This method comprises the steps of: providing a water-soluble ethylenically unsaturated monomer in the presence of a water-absorbent resin having a water absorption rate different from that of a water-absorbent resin obtained by a polymerization reaction of the water-soluble ethylenically unsaturated monomer. It includes a step of polymerizing a saturated monomer.
- the polymerization reaction is performed by a reversed-phase suspension polymerization method.
- a method for producing a water-absorbent resin according to another aspect of the present invention is a method for producing a water-absorbent resin by a polymerization reaction of a water-soluble ethylenically unsaturated monomer.
- the water-soluble ethylenically unsaturated monomer is dissolved and has a water absorption rate different from that of a water-absorbent resin obtained by a polymerization reaction of the water-soluble ethylenically unsaturated monomer.
- a step of preparing an aqueous solution containing a water-absorbent resin a step of adding the aqueous solution to a hydrocarbon solvent to disperse the aqueous solution; and heating the hydrocarbon solvent in which the aqueous solution is dispersed to be included in the aqueous solution.
- a method for producing a water-absorbent resin according to still another aspect of the present invention is a method for producing a water-absorbent resin by a polymerization reaction of a water-soluble ethylenically unsaturated monomer. This method comprises the steps of: adding an aqueous solution containing the water-soluble ethylenically unsaturated monomer to a hydrocarbon solvent and dispersing the same; and dispersing the water-soluble ethylenically unsaturated monomer in the hydrocarbon solvent in which the aqueous solution is dispersed.
- a method for producing a water-absorbent resin according to still another aspect of the present invention is a method for producing a water-absorbent resin by a polymerization reaction of a water-soluble ethylenically unsaturated monomer.
- This method comprises the steps of: obtaining a slurry by polymerizing the water-soluble ethylenically unsaturated monomer; and adding the water-soluble ethylenically unsaturated monomer to the slurry. Adding an ethylenically unsaturated monomer and further carrying out a polymerization reaction of the added water-soluble ethylenically unsaturated monomer.
- a water-absorbing resin having a water absorption rate different from the water-absorption rate of the water-absorbent resin obtained by the polymerization reaction of the water-soluble ethylenically unsaturated monomer obtained by the polymerization reaction of the water-soluble ethylenically unsaturated monomer.
- the above polymerization reaction is carried out in the presence of.
- a method for producing a water-absorbing resin according to still another aspect of the present invention is a method for producing a water-absorbing resin by a polymerization reaction of a water-soluble ethylenically unsaturated monomer. This method comprises the steps of obtaining a slurry by polymerizing the water-soluble ethylenically unsaturated monomer, and absorbing water obtained by the polymerization reaction of the water-soluble ethylenically unsaturated monomer with the slurry.
- a water-absorbent resin having a water absorption rate different from the water-absorption rate of the water-soluble resin and adding the water-soluble ethylenically unsaturated monomer to the added water-soluble ethylenically unsaturated monomer. And a step for further conducting the polymerization reaction.
- the water-absorbent resin having a water absorption rate different from that of the water-absorbent resin obtained by the polymerization reaction of the water-soluble ethylenically unsaturated monomer is used. Since the water-soluble ethylenically unsaturated monomer undergoes a polymerization reaction in the presence of water, the water-absorbing resin is a composite of water-absorbing resins having different water absorption rates, that is, the water-absorbing resin and the water-soluble ethylene present in the polymerization reaction system. A water-absorbent resin composited with a water-absorbent resin obtained by a polymerization reaction of a unsaturated monomer can be produced. Such a water-absorbing resin can increase the diffusivity of the liquid to be absorbed while reducing the amount of the liquid to be absorbed to return.
- the water-absorbent resin according to the present invention comprises a first water-absorbent resin component obtained by a polymerization reaction of a water-soluble ethylenically unsaturated monomer, and a composite with the first water-absorbent resin component. And a second water-absorbent resin component having a different water absorption rate from the first water-absorbent resin component.
- the polymerization method employed in the production method of the present invention is not particularly limited, and may be various commonly known polymerization methods such as a reversed-phase suspension polymerization method and an aqueous solution polymerization method. However, in the present invention, it is preferable to employ a reversed-phase suspension polymerization method since a desired effect can be obtained.
- the production method of the present invention will be described on the assumption that the reversed-phase suspension polymerization method is employed as the polymerization reaction.
- the water-soluble ethylenically unsaturated monomer used in the present invention is not particularly limited, and is usually used for polymerization. Specifically, acrylic acid, methatalylic acid, 2-acrylamide-12-methylpropanesulfonic acid, 2-methacrylinoleamide 2-methylprononsulfonic acid and their salts ( Ammonia salt, metal salt, etc.), acrylamide, metaacrylamide, N, N-dimethylacrylamide, 2-hydroxyethyl acrylate, 2-hydroxyethylamine
- Non-ionic monomers such as N-methyl methacrylate, N-methyl methacrylate, N-methylol methacrylamide, getyl aminoethyl ethyl acrylate, getyl amino ethyl ethyl acrylate, Jethyl amino propyl acrylate Rate, getylamino propyl methacrylate Rate, getyl amino propyl acrylamide
- amino-containing unsaturated monomers such as dimethyla
- water-soluble ethylenically unsaturated monomers preferred are acrylic acid, methacrylic acid and their alkali salts, acrylamide, metaacrylamide because of their industrial availability.
- acrylic acid, methacrylic acid and their alkali salts acrylamide, metaacrylamide because of their industrial availability.
- acrylamide acrylamide, metaacrylamide because of their industrial availability.
- N, N—Jim This is a cryacrylamide.
- the above-mentioned water-soluble ethylenically unsaturated monomer is usually used in the form of an aqueous solution.
- the concentration of the water-soluble ethylenically unsaturated monomer is 25% by weight. /. It is preferable to set the saturation concentration.
- the hydrocarbon solvent used here is an aliphatic hydrocarbon solvent, an alicyclic hydrocarbon solvent or an aromatic hydrocarbon solvent.
- the aliphatic hydrocarbon solvent include n-hexane, n-heptane and lignin.
- the alicyclic hydrocarbon solvent include cyclopentane, methynolecyclopentane, cyclohexane, and methylcyclohexane.
- aromatic hydrocarbon solvent examples include benzene, toluene, and xylene.
- hydrocarbon solvents preferred are n-hexane, n-heptane, cyclohexane, toluene and xylene, which are industrially constant in quality, easily available and inexpensive.
- hydrocarbon solvents may be used in combination of two or more.
- surfactant or a polymer protective colloid it is preferable to add a surfactant or a polymer protective colloid to the hydrocarbon solvent in advance.
- Surfactants and polymer-protected colloids may be used together.
- the surfactant used here is not particularly limited as long as it can reverse-suspend polymerization of the aqueous solution of the water-soluble ethylenically unsaturated monomer.
- Specific examples of surfactants that can be used include nonionic surfactants such as sorbitan fatty acid esters, polyglycerin fatty acid esters, sucrose fatty acid esters, sorbitol fatty acid esters, and polyoxyethylene alkylphenyl ethers. Agents. Such a nonionic surfactant may be used as a mixture of two or more kinds.
- polymer protective colloids include, for example, ethyl cellulose, Ethyl hydroxethyl cellulose, oxidized polyethylene, maleic anhydride-modified polyethylene, maleic anhydride-modified polybutadiene, anhydrous maleic anhydride-modified EPDM (ethylene 'propylene', 'gen', turbo resin) are used.
- nonionic surfactants and polymer-protected colloids include fatty acid salts, alkyl benzene sulfonates, alkyl methyl taurates, polyoxyethylene alkyl phenyl ether sulfates, and polyoxyethylene. It can also be used in combination with an ionic surfactant such as an alkyl ether sulfonate.
- the amount of the surfactant, the polymer-protected colloid, or the mixture of the surfactant and the polymer-protected colloid is usually 0.1 to 5% by weight of the aqueous solution of the water-soluble ethylenically unsaturated monomer. And preferably 0.2 to 3% by weight. If the amount used is less than 0.1% by weight, the emulsification will be insufficient. Conversely, if the content exceeds 5% by weight, a proportional effect cannot be obtained, which is rather uneconomical.
- a crosslinking agent may be used, if desired. Usually, it is preferable to add the crosslinking agent in advance to the above-mentioned aqueous solution of the water-soluble ethylenically unsaturated monomer.
- the crosslinker which can be used herein has two or more polymerizable unsaturated groups or reactive functional groups. (The crosslinker having two or more polymerizable unsaturated groups includes ethylene glycol.
- Di- or triacrylic esters or di- or tri-methacrylic acids of polyols such as Acid esters, unsaturated polyesters obtained by reacting the above-mentioned polyols with unsaturated acids such as maleic acid and fumaric acid, bisacrylamides such as N, N'-methylenebisacrylamide, Di- or tri- obtained by reacting polyepoxide with acrylic acid or methacrylic acid
- Acrylic acid E scan ethers Wakashi Ku di or Application Benefits main Taata acrylic acid esters, Porii element such Kisamechirenjii Soshiane harvest Li range Isoshianeto to, Carbamyl diacrylate or carbamyl dimethyl methacrylate obtained by reacting animate with hydroxyxetyl acrylate or hydroxyxethyl metaacrylate
- aryl phthalate, N, N ', N'-triaryl succinate, and jibiel benzene can be exemplified.
- crosslinking agents having two or more polymerizable unsaturated groups preferred are ethylene glycol diacrylate, ethylene glycol diacrylate, diethylene glycol / resiata acrylate, and diethylene glycol dimethacrylate.
- a cross-linking agent having two or more reactive functional groups for example, a diglycidyl ether compound, a haloepoxy compound, an isocyanate compound and the like can be used. Among them, the diglycidyl ether compound is preferable.
- the diglycidyl ether compound examples include, for example, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polypropylene ⁇ pyrendichol diglycidyl ether, glycerin diglycidyl ether, Examples include polyglycerin diglycidyl ether. Particularly preferred among these is ethylene glycol diglycidyl ether.
- haloepoxy compound examples include epichlorohydrin, epibromohydrin, and ⁇ -methylepichlorohydrin.
- isocyanate compound examples include 2,4—tolylene diisocyanate and hexamethylenedi succinate.
- the above-mentioned crosslinking agent may have two or more polymerizable unsaturated groups and two or more reactive functional groups at the same time.
- the amount used is usually water-soluble It is set to 0.001 to 5% by weight of the unsaturated monomer. If the amount used is less than 0.001% by weight, the water solubility of the obtained resin is increased, and the resin may not be able to function as a water absorbing resin. Conversely, if it exceeds 5% by weight, satisfactory water absorption cannot be obtained.
- a radical polymerization initiator When performing the polymerization reaction in the present invention, a radical polymerization initiator is used.
- a commonly used water-soluble radical polymerization initiator such as potassium persulfate, ammonium persulfate, or sodium persulfate is preferably used.
- Such a radical polymerization initiator can also be used as a redox initiator in combination with a sulfite or the like.
- an oil-soluble radical polymerization initiator can also be used. However, when an oil-soluble radical polymerization initiator is used, the resulting polymer is generally water-soluble, so that the above-mentioned crosslinking agent must be used to obtain the water-absorbing resin of the present invention.
- the oil-soluble radical polymerization initiator it is preferable to use benzoyl peroxide, azobisisobutyrate and the like.
- the amount of the radical polymerization initiator is usually 0 of the water-soluble ethylenically unsaturated monomer. 0 0 5-1. 0 mol 0/0. If the amount used is less than 0.005 mol%, it takes a long time for the polymerization reaction, and if it exceeds 1.0 mol%, it is dangerous because a rapid polymerization reaction occurs.
- the polymerization temperature at the time of carrying out the polymerization reaction differs depending on the polymerization initiator used, and is usually from 20 to 110 ° C, preferably from 40 to 80 ° C. If the polymerization temperature is as low as 20 ° C., the polymerization rate is reduced and the polymerization time is prolonged, which is not economical. Conversely, if the temperature is higher by 110 ° C, it becomes difficult to remove the heat of polymerization, and it becomes difficult to carry out a smooth polymerization reaction.
- the polymer of the water-soluble ethylenically unsaturated monomer thus obtained is usually obtained as a slurry.
- the water-absorbing resin present in the reaction system when performing the above-mentioned polymerization reaction has a water-absorbing rate different from the water-absorbing rate of the water-absorbent resin produced by the polymerization of the water-soluble ethylenically unsaturated monomer. It has. In other words, water absorption having a higher water absorption rate than the water absorption rate of the manufactured water absorbent resin It is a water-absorbent resin having a water absorption speed lower than that of the resin or the water-absorbent resin to be produced.
- Such a water-absorbing resin is not particularly limited, and various kinds of commercially available general water-absorbing resins can be used.
- a starch-based water-absorbing resin such as a hydrolyzate of a starch-acrylonitrile graft copolymer or a neutralized product of a starch-acrylic acid graft copolymer, and vinyl acetate hydrochloride.
- examples thereof include saponified acrylate copolymers, polyacrylic acid part neutralized products, maleic anhydride-isobutylene copolymer, and polymers of the above-mentioned water-soluble ethylenically unsaturated monomers.
- two or more of these water absorbing resins may be used in combination.
- water-absorbing resin As that produced by polymerization of the above-mentioned water-soluble ethylenically unsaturated monomer. More specifically, acrylic acid, metaacrylic acid, 2-acrylylamide 2-methylpropanesulfonic acid, 2-methatalinoleylamide 1-2-methylpropane snolefonic acid and their alkali salts ( Ammonia salt, metal salt, etc.), acrylamide, methacrylamide, N, N-dimethylacrylamide, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate
- Nonionic monomers such as N-methylol acrylo amide, N-methyl alcohol methallyl amide, getyl aminoethyl acrylate, getyl aminoethyl methacrylate, getyl amino propyl acrylate, getyl amide Pilmetacrerate, Jetilaminopro Water-soluble ethylenically unsaturated monomers such as amide
- a water-absorbing resin obtained by polymerization it is preferable to use a water-absorbing resin obtained by polymerization.
- a water-absorbing resin comprising a homopolymer or a copolymer of acrylic acid, methacrylic acid and their salts, acrylamide, methacrylamide, and N, N-dimethylacrylamide is used. Is preferred.
- the amount of the water-absorbing resin to be present in the polymerization reaction system is usually It is preferably set to 1 to 100% by weight based on the water-soluble ethylenically unsaturated monomer to be used, and 5 to 5 ° by weight. /. It is more preferable to set to.
- the amount is less than 1% by weight, it is difficult to obtain a water-absorbing resin intended by the present invention.
- it exceeds 100% by weight the polymerization reaction system becomes unstable in the reverse-phase suspension polymerization reaction, and lumps tend to be formed, instead of being uneconomical.
- various methods are employed as long as the water-absorbing resin can be present during the polymerization reaction of the water-soluble ethylenically unsaturated monomer. Can be done. Specifically, a method of pre-existing in a water-soluble ethylenically unsaturated monomer aqueous solution, a method of adding a water-soluble ethylenically unsaturated monomer aqueous solution to a hydrocarbon solvent and dispersing it, A method of adding a water absorbent resin to the hydrocarbon solvent is employed.
- the desired water-absorbent resin can be produced by a multi-stage polymerization method.
- a multistage polymerization process firstly, c and polymerizing the water-soluble ethylenically unsaturated monomer described above in the polymerization reaction of the first stage, Sula obtained by Li in the polymerization reaction of the first stage Then, a water-soluble ethylenically unsaturated monomer is further added to carry out the second stage polymerization reaction.
- the water-absorbing resin present in the polymerization reaction system may be present in the first-stage polymerization reaction system, or may be present in the second-stage polymerization reaction system. It can also be present in both the first and second stage polymerization reaction systems.
- the water absorbent resin produced by the production method of the present invention is a composite of a water absorbent resin component having a high water absorption rate and a water absorbent resin component having a low water absorption rate.
- the form of the water-absorbing resin obtained by combining the two water-absorbing resin components having different water absorption rates is not particularly limited, but includes, for example, various forms such as powder, granule, sphere, and flake. You can get
- the water-absorbing resin component constituting the portion having a high water-absorbing speed preferably has a water-absorbing speed of less than 10 seconds, more preferably less than 5 seconds. . If the water absorption rate is 10 seconds or more, it is difficult to exhibit satisfactory water absorption in the initial stage of water absorption. on the other hand,
- the water absorption rate of the water-absorbing resin component constituting the portion having a low water absorption rate is preferably longer than 20 seconds, more preferably longer than 30 seconds. If the water absorption rate is less than 20 seconds, the water absorption rate is too high, and the water-absorbent resin gels and blocking easily occurs. Therefore, when the water absorption rate of the two water absorbing resin components constituting the water absorbing resin does not satisfy such a condition, the water absorbing resin is simultaneously absorbed while reducing the amount of reversal of the liquid to be absorbed. It becomes difficult to increase the liquid diffusivity.
- the water absorption speed refers to the time required for 1 g of the water-absorbing resin to completely absorb 25 m ⁇ 0.9% saline under stirring.
- This water absorption rate was determined by adding 0.9% saline solution 25 m £ into a 50 m ⁇ beaker containing a rotor with a length of 20 mm and a diameter of 7 ⁇ ⁇ . It can be determined by adding 1.0 g of water-absorbent resin while stirring at 500 rpm and measuring the time required until a completely free water-free state can be confirmed visually. .
- the water-absorbent resin obtained by the present invention is a composite of a plurality of water-absorbent resin components having different water absorption rates as described above, a plurality of types of water-absorbent resins having different water absorption rates are used. It is possible to impart uniform water absorption performance to the entire body of sanitary materials such as sanitary goods and disposable diapers, which is different from the case of simply mixing, and water absorbents using the same. Therefore, the water-absorbent resin according to the present invention can improve the water-absorbing property, which is difficult to realize with the conventional water-absorbent resin, that is, enhance the diffusivity of the liquid to be absorbed while reducing the amount of the liquid to be absorbed to return. Becomes possible.
- the water-absorbent body formed by spraying the water-absorbent resin according to the present invention on pulp material or the like absorbs the liquid to be absorbed quickly and simultaneously diffuses the liquid to be absorbed widely into the water-absorbent body. Therefore, even if the supply speed of the liquid to be absorbed is high, it is difficult to cause leakage of the liquid to be supplied.
- the water-absorbent resin obtained according to the present invention is used for sanitary materials such as sanitary products and disposable diapers, agricultural and horticultural applications such as water retention agents and soil conditioners, and industrial materials applications such as water stop agents and anti-condensation agents. It can be used in a wide range of fields, but is particularly suitable for sanitary applications.
- sanitary materials such as sanitary products and disposable diapers
- agricultural and horticultural applications such as water retention agents and soil conditioners
- industrial materials applications such as water stop agents and anti-condensation agents. It can be used in a wide range of fields, but is particularly suitable for sanitary applications.
- the present invention will be described in detail with reference to examples.
- each example is shown in correspondence with the corresponding comparative example, but the corresponding comparative example is described first for convenience of explanation and understanding of the examples. Comparative Example 1
- a 500-m ⁇ Erlenmeyer flask was separately prepared, and 92 g of an 80% by weight aqueous solution of acrylic acid was added thereto.
- 152.6 g of a 20.1% by weight aqueous sodium hydroxide solution was added dropwise while cooling with ice from the outside to make 75 mol. / 0 was neutralized to prepare an aqueous solution of acrylic acid partially neutralized.
- 0.1 g of potassium persulfate was further added and dissolved.
- 55-Om fi was added to a 1 ⁇ four-necked cylindrical round bottom flask equipped with a stirrer, a reflux condenser, a dropping funnel and a nitrogen gas inlet tube.
- hexaglyceryl monophosphate with a HLB of 13.1 surfactant: Nonion GV-106 manufactured by NOF Corporation
- the temperature was raised to 50 ° C to dissolve the surfactant, and then cooled to 30 ° C.
- a 500-m Erlenmeyer flask was separately prepared, and to this was added 92 g of an 80% by weight aqueous solution of acrylic acid.
- a 500 m ⁇ Erlenmeyer flask was prepared separately, and 80% by weight 92 g of an aqueous solution of acrylic acid was added.
- 152.6 g of a 20.1% by weight aqueous sodium hydroxide solution was added dropwise while cooling with ice from the outside to neutralize 75 mol%. .11 g and ethylenglycol diglycidyl ether 0.019 g as a citrus preparation were further added and dissolved.
- an aqueous solution of partially neutralized acrylic acid was obtained.
- the polymerization slurry solution obtained by the first-stage polymerization reaction was cooled to 20 ° C., and the same amount of a partially neutralized aqueous acrylic acid solution prepared in the same manner as described above was further added dropwise. Then, the inside of the system was replaced with nitrogen for 30 minutes and the temperature was raised, and the bath temperature was maintained at 70 ° C, and the second stage polymerization reaction was performed for 3 hours ⁇ water and n-butane Was removed by distillation and dried to obtain 196.5 g of a water absorbent resin. The water absorption rate of the obtained water absorbent resin was 57 seconds.
- the measurement was performed according to the method described above.
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019970705084A KR100485227B1 (ko) | 1995-11-30 | 1996-11-25 | 흡수성수지의제조방법 |
EP96938543A EP0807646B1 (en) | 1995-11-30 | 1996-11-25 | Water-absorbent resin and process for its preparation |
KR1019970705084A KR19980701688A (ko) | 1995-11-30 | 1996-11-25 | 흡수성 수지의 제조방법 |
DE69626794T DE69626794T2 (de) | 1995-11-30 | 1996-11-25 | Wasserabsorbierendes harz und verfahren zu seiner herstellung |
JP2005125502A JP3967358B2 (ja) | 1995-11-30 | 2005-04-22 | 吸水性樹脂の製造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33775295A JP4072833B2 (ja) | 1995-11-30 | 1995-11-30 | 吸水性樹脂の製造方法および吸水性樹脂 |
JP7/337752 | 1995-11-30 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/208,422 Continuation US6573330B1 (en) | 1995-11-30 | 1998-12-10 | Process for preparing water-absorbent resin |
Publications (1)
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WO1997019968A1 true WO1997019968A1 (fr) | 1997-06-05 |
Family
ID=18311632
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP1996/003454 WO1997019968A1 (fr) | 1995-11-30 | 1996-11-25 | Procede de production de resine absorbant l'eau |
Country Status (8)
Country | Link |
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US (1) | US6573330B1 (ja) |
EP (1) | EP0807646B1 (ja) |
JP (2) | JP4072833B2 (ja) |
KR (2) | KR100485227B1 (ja) |
CN (1) | CN1134471C (ja) |
DE (1) | DE69626794T2 (ja) |
TW (1) | TW455609B (ja) |
WO (1) | WO1997019968A1 (ja) |
Families Citing this family (50)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH11279287A (ja) * | 1998-03-31 | 1999-10-12 | Nippon Shokubai Co Ltd | 吸水剤組成物および吸水剤の製造方法 |
US6956084B2 (en) * | 2001-10-04 | 2005-10-18 | Bridgestone Corporation | Nano-particle preparation and applications |
JP3754351B2 (ja) * | 2001-11-09 | 2006-03-08 | ユニ・チャーム株式会社 | 使い捨ておむつ |
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Also Published As
Publication number | Publication date |
---|---|
EP0807646A1 (en) | 1997-11-19 |
KR100485227B1 (ko) | 2005-08-04 |
CN1134471C (zh) | 2004-01-14 |
KR19987001688A (en) | 1998-06-25 |
JP3967358B2 (ja) | 2007-08-29 |
CN1175962A (zh) | 1998-03-11 |
JP2005213523A (ja) | 2005-08-11 |
US6573330B1 (en) | 2003-06-03 |
TW455609B (en) | 2001-09-21 |
DE69626794T2 (de) | 2003-10-23 |
JPH09151224A (ja) | 1997-06-10 |
KR19980701688A (ko) | 1998-06-25 |
DE69626794D1 (de) | 2003-04-24 |
JP4072833B2 (ja) | 2008-04-09 |
EP0807646A4 (en) | 1999-06-16 |
EP0807646B1 (en) | 2003-03-19 |
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