WO2022244567A1 - 吸水性樹脂粒子、吸収体及び吸収性物品 - Google Patents
吸水性樹脂粒子、吸収体及び吸収性物品 Download PDFInfo
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Definitions
- the present invention relates to water absorbent resin particles, absorbent bodies and absorbent articles.
- Water-absorbing resin particles are widely used in various fields such as sanitary materials such as disposable diapers, sanitary products, and portable toilets, agricultural and horticultural materials such as water retention agents and soil conditioners, and industrial materials such as water stop agents and anti-condensation agents. ing. It is desirable that the absorber containing water-absorbing resin particles has an excellent absorption rate of body fluids, etc., which are water-absorbing objects.
- Patent Document 1 discloses an absorbent containing water-absorbing resin powder, in which a diffusion improving material having a liquid permeation speed under load of 15 seconds or less is arranged. An absorbent body is disclosed wherein the region has a layer formed at least in part.
- Absorbent materials contained in sanitary products (absorbent articles) such as diapers have a different feel when worn (broadly divided into a lying state such as sleeping and a standing state during activity). Change.
- the inventors of the present invention have found that such changes in the feeling of use of the absorbent body are due to changes in the main areas where the absorbent body is utilized depending on the state of wear.
- the flat portion of the absorber is mainly utilized in the lying state, while the U-curved portion is mainly utilized in the standing state.
- gel blocking phenomenon may occur and the absorption rate may decrease as the number of times of urination increases.
- the water absorbent resin particles are required to have liquid permeability.
- the curved portion of the absorber it is necessary to absorb liquid against gravity, so the water absorbent resin particles are required to have a sufficient water absorption capacity.
- liquid permeability and water absorption are in a trade-off relationship, so it is difficult to produce water-absorbing resin particles having a high permeation rate in both the flat portion and the curved portion by making both of them compatible. .
- the present invention is a new absorbent article that can absorb moisture at a sufficiently high permeation rate regardless of whether it is a flat portion or a curved portion by using it together with conventional water absorbent resin particles.
- An object of the present invention is to provide water-absorbing resin particles.
- One aspect of the present invention is the water-absorbing resin particles, wherein H1 is 1.0 cm or less and H10/H1 is 5.0 or more when the lockup height in the n-minute value is Hn [cm].
- H1 is 1.0 cm or less and H10/H1 is 5.0 or more when the lockup height in the n-minute value is Hn [cm].
- the lockup height at the n-minute value is measured by the following procedure. (1) 0.200 g of water-absorbing resin particles are placed over the entire bottom surface of a cylinder with an inner diameter of 2.0 cm and a depth of 8.0 cm to form a particle layer, and the height of the particle layer is H0 [cm]. . (2) Pour 20 g of physiological saline into the particle layer to swell the particle layer.
- Another aspect of the present invention provides a water absorbent resin composition containing the above water absorbent resin particles and water absorbent resin particles other than the water absorbent resin particles.
- Another aspect of the present invention provides an absorbent body containing the water absorbent resin particles or the water absorbent resin composition.
- Another aspect of the present invention provides an absorbent article comprising the absorbent body.
- the low H1 of the water-absorbing resin particles indicates that rapid water absorption is suppressed in the initial stage of water absorption.
- a high H10/H1 ratio of the water-absorbing resin particles indicates that rapid water absorption is suppressed in the initial stage of water absorption, but high water absorption is exhibited after a predetermined time has elapsed from the start of water absorption.
- the present inventors have found that by adjusting H1 and H10/H1 within the ranges described above, both the liquid permeation speed in the flat portion of the absorbent body and the liquid permeation speed in the curved portion of the absorbent body are improved. The present inventors have found that the present invention has been completed.
- FIG. 1 is a cross-sectional view showing one embodiment of an absorbent article; FIG. It is a schematic diagram which shows the method to measure non-pressure DW.
- FIG. 3 is a schematic diagram showing a water absorption test method for evaluating the permeation rate of liquid in the curved portion of the absorbent body.
- 1 is scanning electron microscope (SEM) photographs of water absorbent resin particles of Examples 1 and 2.
- FIG. 4 is SEM photographs of water absorbent resin particles of Examples 3, 4 and 5.
- FIG. 4 is SEM photographs of water absorbent resin particles of Comparative Examples 2 and 3.
- (Meth)acrylic as used herein means both acrylic and methacrylic.
- "Acrylate” and “methacrylate” are similarly written as “(meth)acrylate”. The same is true for other similar terms.
- the upper limit value or lower limit value of the numerical range in one step can be arbitrarily combined with the upper limit value or lower limit of the numerical range in another step.
- the upper or lower limits of the numerical ranges may be replaced with the values shown in the examples.
- the materials exemplified in this specification may be used singly or in combination of two or more.
- the water absorbent resin particles according to the present embodiment have H1 of 1.0 cm or less and H10/H1 of 5.0 or more when the lockup height at the n-minute value is Hn [cm].
- the lockup height at the n-minute value is measured by the following procedure. (1) 0.200 g of water-absorbing resin particles are placed over the entire bottom surface of a cylinder with an inner diameter of 2.0 cm and a depth of 8.0 cm to form a particle layer, and the height of the particle layer is H0 [cm]. . (2) Pour 20 g of physiological saline into the particle layer to swell the particle layer. (3) Record the height of the particle layer when n minutes have passed since the total amount of physiological saline was added as Hn', and from the formula represented by Hn'-H0, the lockup height Hn [ cm] is calculated.
- Physiological saline is an aqueous solution containing salt at a concentration of 0.9% by mass based on the volume (mL) of the physiological saline. Other details of the test conditions will be described in Examples below.
- H1 is the lockup height at the 1 minute value.
- H1 is 0.9 cm or less, 0.8 cm or less, 0.9 cm or less, 0.8 cm or less, or 0.9 cm or less, 0.8 cm or less, or 0.9 cm or less, 0.8 cm or less, or 0.9 cm or less, or 0.8 cm or less, or 0.9 cm or less, or 0.8 cm or less, or 0.9 cm or less, or 0.8 cm or less, or 0.9 cm or less, or 0.8 cm or less, or 0.9 cm or less, or 0.8 cm or less, or 0.9 cm or less, or 0.8 cm or less, or 0.9 cm or less, or 0.8 cm or less, or 0.8 cm or less, or 0.8 cm or less. It may be 7 cm or less, 0.6 cm or less, 0.5 cm or less, or 0.4 cm or less.
- H1 is not particularly limited, it may be 0.1 cm or more, 0.2 cm or more, or 0.3 cm or more.
- H1 may be 0.1 cm or more and 1.0 cm or less, from the viewpoint of further improving the permeation speed of the liquid in the planar portion of the absorbent body, and from the viewpoint of further improving the permeation speed of the liquid into the absorbent body. , 0.1 cm to 0.9 cm, 0.1 cm to 0.8 cm, 0.1 cm to 0.7 cm, 0.1 cm to 0.6 cm, 0.1 cm to 0.5 cm, or 0.1 cm It may be greater than or equal to 0.4 cm or less.
- H5 is the lockup height at the 5 minute value.
- H5 may be 1.0 cm or greater, 1.5 cm or greater, 2.0 cm or greater, 2.5 cm or greater, 3.0 cm or greater, 3.5 cm or greater, 4.0 cm or greater, or 4.5 cm or greater.
- H5 is 10.0 cm or less, 9.5 cm or less, 9.0 cm or less, 8.5 cm or less, 8.0 cm or less, 7.5 cm or less, 7.0 cm or less, 6.5 cm or less, 6.0 cm or less; It may be 5 cm or less, or 5.0 cm or less.
- H5 is 1.0 cm or more and 10.0 cm or less, 1.0 cm or more and 9.5 cm or less, 1.5 cm or more and 9.0 cm or less, 1.5 cm or more and 8.5 cm or less, 2.0 cm or more and 8.0 cm or less. 0 cm to 7.5 cm, 2.5 cm to 7.0 cm, 3.0 cm to 6.5 cm, 3.5 cm to 6.0 cm, 4.0 cm to 5.5 cm, or 4.5 cm to 5.5 cm5. It may be 0 cm or less.
- H10 is the lockup height at the 10 minute value.
- H10 is 1.0 cm or more, 1.5 cm or more, 2.0 cm or more, 2.5 cm or more, 3.0 cm or more, 3.5 cm or more, 4.0 cm or more, 4.5 cm or more, or 5.0 cm or more.
- you can H10 is 10.0 cm or less, 9.5 cm or less, 9.0 cm or less, 8.5 cm or less, 8.0 cm or less, 7.5 cm or less, 7.0 cm or less, 6.5 cm or less, 6.0 cm or less, or 5 .5 cm or less.
- H10 is 1.0 cm or more and 10.0 cm or less, 1.0 cm or more and 9.5 cm or less, 1.5 cm or more and 9.0 cm or less, 2.0 cm or more and 8.5 cm or less, 2.5 cm or more and 8.0 cm or less. It may be 0 cm to 7.5 cm, 3.5 cm to 7.0 cm, 4.0 cm to 6.5 cm, 4.5 cm to 6.0 cm, or 5.0 cm to 5.5 cm.
- H10/H1 is 5.5 or more from the viewpoint of further improving the permeation rate of liquid in the flat portion of the absorbent body and further improving the permeation rate of liquid in the curved portion of the absorbent body; 0 or more, 6.5 or more, 7.0 or more, 7.5 or more, 8.0 or more, 8.5 or more, 9.0 or more, 9.5 or more, 10.0 or more, 10.5 or more, 11. It may be 0 or greater, 11.5 or greater, 12.0 or greater, 12.5 or greater, or 13.0 or greater.
- the upper limit of H10/H1 is not particularly limited, but from the viewpoint of further improving the liquid permeation rate in the flat portion of the absorbent body and the liquid permeation rate in the curved portion of the absorbent body, 20.0 or less, 19.5 or less, 19.0 or less, 18.5 or less, 18.0 or less, 17.5 or less, 17.0 or less, 16.5 or less, 16.0 or less, 15.5 or less, It may be 15.0 or less, 14.5 or less, or 14.0 or less. H10/H1 may be 5.0 or more and 20.0 or less.
- 6.0 or more and 20.0 or less From the viewpoint of further improvement, 6.0 or more and 20.0 or less, 7.0 or more and 19.5 or less, 8.0 or more and 19.0 or less, 8.5 or more and 18.5 or less, 9.0 or more and 18.0 or less , 9.5 to 17.5, 10.0 to 17.0, 10.5 to 16.5, 11.0 to 16.0, 11.5 to 15.5, 12.0 or more It may be 15.0 or less, 12.5 or more and 14.5 or less, or 13.0 or more and 14.0 or less.
- H5/H1 is 4.0 or more from the viewpoint of further improving the permeation speed of liquid in the flat portion of the absorbent body and further improving the permeation speed of liquid in the curved portion of the absorbent body. 5 or more, 5.0 or more, 5.5 or more, 6.0 or more, 6.5 or more, 7.0 or more, 7.5 or more, 8.0 or more, 8.5 or more, 9.0 or more, 9. It may be 5 or greater, 10.0 or greater, 10.5 or greater, 11.0 or greater, or 11.5 or greater.
- the upper limit of H5/H1 is not particularly limited, but from the viewpoint of further improving the liquid permeation rate in the planar portion of the absorbent body and the liquid permeation rate in the curved portion of the absorbent body, 20.0 or less, 19.5 or less, 19.0 or less, 18.5 or less, 18.0 or less, 17.5 or less, 17.0 or less, 16.5 or less, 16.0 or less, 15.5 or less, It may be 15.0 or less, 14.5 or less, 14.0 or less, 13.5 or less, 13.0 or less, 12.5 or less, or 12.0 or less.
- H5/H1 is 4.0 or more and 20.0 from the viewpoint of further improving the permeation speed of liquid in the flat portion of the absorbent body and further improving the permeation speed of liquid in the curved portion of the absorbent body.
- Hn can be adjusted within the above range, for example, depending on the type and amount of material used for manufacturing the water-absorbing resin particles.
- a method for obtaining water-absorbent resin particles in which the ratio of Hn and each Hn is within the above range for example, a method of providing a coating layer on at least part of the surface of the water-absorbent resin particles using a coating material can be mentioned.
- the ratio of Hn and each Hn is to adjust the solubility in water of the coating layer, adjust the amount of the coating layer in the water absorbent resin (the amount of coating material used), and reduce the coating material with low film-forming properties. It is possible to adjust to the range described above by using or combining these methods.
- one example of a method for adjusting H1 and H10/H1 is to provide a water-absorbing crosslinked polymer with a water-insoluble coating layer having an appropriate amount of missing portions where the water-absorbing crosslinked polymer is exposed.
- a water-absorbing crosslinked polymer in the early stage of water absorption, rapid water absorption is suppressed by the poorly water-soluble coating layer, so H1 tends to be low.
- the water-absorbing crosslinked polymer has an appropriate amount of exposed defects, water absorption gradually begins through the defects, and as the water-absorbing resin particles swell, cracks in the coating layer and water-absorbing resin particles develop.
- the defective portion where the water-absorbing crosslinked polymer is exposed may be provided in advance, or the coating layer may be provided with a readily water-soluble portion capable of forming a defective portion by dissolving in the latter stage of water absorption, so that after the start of water absorption A missing portion can also be formed.
- the 2-minute value of the non-pressurized DW of the water absorbent resin particles is 0.1 g/g or more, 0.2 g/g or more, 0.3 g/g or more, 0.4 g/g or more, 0.5 g/g or more, It may be 0.6 g/g or greater, 0.7 g/g or greater, 0.8 g/g or greater, 0.9 g/g or greater, or 1.0 g/g or greater.
- the 2-minute value of the unpressurized DW of the water absorbent resin particles is 15.0 g/g or less, 14.0 g/g or less, 13.0 g/g or less, 12.0 g/g or less, 11.0 g/g or less, 10.0 g/g or less, 9.0 g/g or less, 8.0 g/g or less, 7.0 g/g or less, 6.0 g/g or less, 5.0 g/g or less, 4.0 g/g or less, 3 0 g/g or less, 2.0 g/g or less, or 1.5 g/g or less.
- the 2-minute value of the unpressurized DW of the water absorbent resin particles is 0.1 g/g or more and 15.0 g/g or less, 0.1 g/g or more and 14.0 g/g or less, 0.2 g/g or more and 13.0 g.
- /g or less 0.2 g/g to 12.0 g/g, 0.3 g/g to 11.0 g/g, 0.3 g/g to 10.0 g/g, 0.4 g/g or more9 .0 g/g or less, 0.4 g/g or more and 8.0 g/g or less, 0.5 g/g or more and 7.0 g/g or less, 0.5 g/g or more and 6.0 g/g or less, 0.6 g/g 0.7 g/g to 4.0 g/g, 0.8 g/g to 3.0 g/g, 0.9 g/g to 2.0 g/g, or 1. It may be 0 g/g or more and 1.5 g/g or less.
- the non-pressurized DW means that the water-absorbent resin particles, under no pressure, contact the physiological saline (saline with a concentration of 0.9% by mass) until a predetermined time elapses. It is the water absorption rate expressed by the amount absorbed.
- the non-pressurized DW is represented by the absorbed amount (g) per 1 g of water-absorbing resin particles before absorption of physiological saline.
- the 2-minute value of non-pressurized DW means the amount absorbed 2 minutes after the water-absorbent resin particles come into contact with physiological saline.
- the shape of the water-absorbing resin particles is not particularly limited, and may be, for example, substantially spherical, crushed, or granular, and particles may be formed by aggregating primary particles having these shapes.
- the water absorbent resin particles may contain polymer particles.
- the polymer particles may be crosslinked polymers formed by polymerization of monomers containing ethylenically unsaturated monomers.
- the polymer particles may contain ethylenically unsaturated monomers as monomer units.
- Polymer particles can be produced, for example, by a method including a step of polymerizing a monomer containing an ethylenically unsaturated monomer. Examples of the polymerization method include a reverse phase suspension polymerization method, an aqueous solution polymerization method, a bulk polymerization method, a precipitation polymerization method, and the like.
- the ethylenically unsaturated monomer may be a water-soluble ethylenically unsaturated monomer (an ethylenically unsaturated monomer whose solubility in 100 g of water is 1.0 g or more at 25°C).
- water-soluble ethylenically unsaturated monomers include (meth)acrylic acid and its salts, 2-(meth)acrylamido-2-methylpropanesulfonic acid and its salts, (meth)acrylamide, N,N-dimethyl (Meth)acrylamide, 2-hydroxyethyl (meth)acrylate, N-methylol (meth)acrylamide, polyethylene glycol mono (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, N,N-diethylaminopropyl (meth) acrylates, and diethylaminopropyl (meth)acrylamide.
- the amino group may be quaternized.
- Ethylenically unsaturated monomers may be used alone or in combination of two or more.
- the acidic group may be neutralized with an alkaline neutralizer before use in the polymerization reaction.
- the neutralization degree of the ethylenically unsaturated monomer with an alkaline neutralizing agent is, for example, 10 to 100 mol%, 50 to 90 mol%, or 60 to 80 mol of the acidic groups in the ethylenically unsaturated monomer. %.
- the ethylenically unsaturated monomer is at least one selected from the group consisting of (meth)acrylic acid and its salts, acrylamide, methacrylamide, and N,N-dimethylacrylamide. It may contain a compound of the species.
- the ethylenically unsaturated monomer may contain at least one compound selected from the group consisting of (meth)acrylic acid and its salts, and acrylamide.
- a monomer other than the ethylenically unsaturated monomer described above may be used as the monomer for obtaining the water absorbent resin particles.
- Such monomers can be used, for example, by mixing with an aqueous solution containing the ethylenically unsaturated monomers described above.
- the amount of ethylenically unsaturated monomer used may be 70 to 100 mol % of the total amount of monomers.
- the ratio of (meth)acrylic acid and its salt may be 70 to 100 mol % with respect to the total amount of monomers.
- cross-linking occurs due to self-crosslinking during polymerization
- cross-linking may be promoted by using an internal cross-linking agent.
- the use of an internal cross-linking agent facilitates control of the water absorption properties (water retention capacity, etc.) of the water-absorbing resin particles.
- An internal cross-linking agent is usually added to the reaction solution during the polymerization reaction.
- At least the polymer in the surface layer portion of the polymer particles may be crosslinked by reaction with a surface crosslinking agent.
- the surface cross-linking agent may be, for example, a compound having two or more functional groups (reactive functional groups) having reactivity with functional groups derived from ethylenically unsaturated monomers.
- the polymer particles may contain a certain amount of water in addition to the polymer of ethylenically unsaturated monomers, and may further contain various additional components inside.
- additional ingredients include gel stabilizers, metal chelating agents.
- the water absorbent resin particles may further contain inorganic particles adhering to the surface of the polymer particles.
- inorganic particles include silica particles such as amorphous silica.
- the amount of inorganic particles adhering to the surface of the polymer particles is 0.05% by mass or more, 0.1% by mass or more, 0.15% by mass or more, or 0.2% by mass, based on the mass of the polymer particles. % or more, and may be 5.0% by mass or less, 3.0% by mass or less, 1.0% by mass or less, 0.5% by mass or less, or 0.3% by mass or less.
- the average particle size of the inorganic particles may be 0.1-50 ⁇ m, 0.5-30 ⁇ m, or 1-20 ⁇ m. The average particle size can be measured by a pore electrical resistance method or a laser diffraction/scattering method, depending on the properties of the particles.
- the particle size distribution of the water-absorbent resin particles may be adjusted by performing operations such as particle size adjustment using classification with a sieve as necessary. For example, a fraction that has passed through a sieve with an opening of 850 ⁇ m and has not passed through a sieve with an opening of 250 ⁇ m may be used as the water absorbent resin particles.
- the water absorbent resin particles may be coated resin particles having polymer particles and a coating layer covering at least part of the surface of the polymer particles.
- the coating layer can be formed, for example, by a method including the step of coating at least a portion of the polymer particles with a coating material to form a coating layer on at least a portion of the surface of the polymer particles.
- the component constituting the coating layer may be, for example, at least one selected from the group consisting of polymers containing substituted or unsubstituted alkenes as structural units (monomer units) and fatty acids.
- a polymer containing an unsubstituted alkene as a structural unit may be, for example, a homopolymer containing a substituted or unsubstituted alkene as a structural unit.
- homopolymers containing substituted or unsubstituted alkenes as structural units include polyvinyl alcohol and polystyrene.
- Polymers containing unsubstituted alkenes as structural units may be copolymers containing only two or more unsubstituted alkenes as structural units, and monomer components other than one or two or more unsubstituted alkenes and unsubstituted alkenes. It may be a copolymer containing it as a structural unit.
- a polymer containing an unsubstituted alkene as a structural unit may be a copolymer containing one type of unsubstituted alkene and a monomer component other than the unsubstituted alkene as a structural unit.
- unsubstituted alkenes examples include ethylene, propylene, and butene.
- the unsubstituted alkene may be ethylene and/or propylene and may be ethylene.
- a water-soluble ethylenically unsaturated monomer may be used as the monomer component other than the unsubstituted alkene.
- the water-soluble ethylenically unsaturated monomer the compounds listed above can be used.
- the water-soluble ethylenically unsaturated monomer may be (meth)acrylic acid and/or its salts.
- a copolymer containing an alkene as a structural unit may be a copolymer containing ethylene and a water-soluble ethylenically unsaturated monomer as a structural unit, and includes ethylene and (meth) acrylic acid and / or a salt thereof as a structural unit. It may be a copolymer, a copolymer containing ethylene and an acrylate as structural units, or a copolymer containing ethylene and sodium acrylate as structural units (ethylene-sodium acrylate copolymer).
- fatty acids examples include vegetable oils such as palm oil, castor oil, rapeseed oil, olive oil, avocado oil, and sesame oil, and processed products thereof (e.g., hardened oils); beef tallow, milk fat, lard, horse fat, egg yolk oil, and the like. and processed products thereof; and at least one selected from the group consisting of higher fatty acids such as 12-hydroxystearic acid, palmitoleic acid, oleic acid and linoleic acid.
- the fatty acid may be vegetable oil and/or animal oil, may be vegetable oil, and is at least one selected from the group consisting of palm oil, castor oil, rapeseed oil, olive oil, avocado oil, and sesame oil. of vegetable oil.
- the coating layer may contain a polymer containing alkylene oxide as a structural unit.
- the coating layer may contain a polymer containing an alkylene oxide as a structural unit together with the polymer containing the substituted or unsubstituted alkene as a structural unit.
- the coating layer contains a polymer (substance A) containing a substituted or unsubstituted alkene as a structural unit and a polymer (substance B) containing an alkylene oxide as a structural unit
- the ratio (A/B) of the A content (% by mass) may be, for example, 1-20, 5-15 or 8-12.
- the coating layer contains a polymer containing a substituted or unsubstituted alkene as a structural unit and a polymer containing an alkylene oxide as a structural unit
- the polymer containing an alkylene oxide as a structural unit dissolves after the water-absorbent resin particles start to absorb water. As a result, it can function as a defect exposing the crosslinked polymer having water absorption properties.
- the polymer containing an alkylene oxide as a structural unit may be a polyalkylene oxide (homopolymer) containing only one alkylene oxide as a structural unit, or a polyalkylene oxide (copolymer) containing two or more alkylene oxides as a structural unit. ), or a copolymer containing one or more alkylene oxides and monomer components other than alkylene oxides as structural units.
- a polymer containing an alkylene oxide as a structural unit may be a polyalkylene oxide containing only one type of alkylene oxide as a structural unit.
- Alkylene oxides include, for example, ethylene oxide and propylene oxide.
- Alkylene oxide may be ethylene oxide.
- the polymer containing alkylene oxide as a structural unit is selected from the group consisting of a homopolymer (polyethylene glycol) containing ethylene oxide as a structural unit and an ethylene-propylene copolymer containing ethylene oxide and propylene oxide as structural units. At least one may be used, and may be polyethylene glycol.
- the coating layer may be a poorly water-soluble coating layer.
- the poorly water-soluble coating layer means a layer having a solubility of 15% by mass or less in 100 g of water at 25°C.
- the soluble content of the coating layer in 100 g of water at 25° C. may be, for example, 12% by mass or less, or 10% by mass or less.
- the lower limit of the coating layer solubility in 100 g of water at 25° C. is not particularly limited, but may be, for example, more than 0% by mass, 1% by mass or more, 5% by mass or more, or 8% by mass or more.
- the solubility of the coating layer in 100 g of water at 25° C. is measured by the method described in Examples below. When the dissolved amount of the coating layer is decreased and/or when the amount of the coating layer is increased, rapid water absorption by the water-absorbing resin particles in the initial stage of water absorption is likely to be suppressed.
- the ratio of the coating layer in the water absorbent resin particles may be, for example, 1 to 40 parts by mass with respect to 100 parts by mass of the polymer particles.
- the coated resin particles can be obtained by a method including coating at least a portion of the polymer particles with a coating material to form a coating layer on at least a portion of the surface of the polymer particles.
- the coating material may contain a liquid medium or the like in addition to the constituent components of the coating layer described above.
- Liquid media include, for example, water and ethers such as tetrahydrofuran.
- Formation of the coating layer can be performed using, for example, a granulator.
- Granulators include, for example, fluid bed granulators.
- coated resin particles using a fluidized bed granulator first, polymer particles are put into a container equipped with the fluidized bed granulator, from which hot air can be sent out from the bottom, and the polymer particles are added in advance. keep it fluid. Thereafter, the coating material is sprayed onto the fluidized polymer particles while drying. The polymer particles after being sprayed with the coating material may be dried if necessary.
- the water retention capacity of the water-absorbing resin particles with respect to physiological saline may be 25 g/g or more, 30 g/g or more, 35 g/g or more, 40 g/g or more, or 45 g/g or more, and may be 60 g/g or less, 55 g/g or more. g or less, 50 g/g or less, or 45 g/g or less.
- the physiological saline water retention capacity of the water-absorbing resin particles is measured by the method described in the examples below. When coated resin particles are used as the water-absorbent resin particles, the water-retention amount of the water-absorbent resin particles against physiological saline before forming the coating layer may be within the above range.
- a water-absorbent resin composition according to one embodiment includes the above-described water-absorbent resin particles (resin particles A) and water-absorbent resin particles other than the water-absorbent resin particles (resin particles B).
- the type of resin particles A and B, the mixing ratio, etc. are appropriately changed to control the permeation speed in the planar portion and the curved portion of the absorbent article within a suitable range. obtain.
- the content of resin particles A may be, for example, 5 parts by mass or more, or 15 parts by mass or more, with respect to a total of 100 parts by mass of resin particles A and resin particles B, and may be 95 parts by mass. parts or less, 85 mass parts or less, 60 mass % or less, 40 mass % or less, 30 mass % or less, or 25 mass % or less.
- the lower limit of the water retention amount with respect to physiological saline (0.9% by mass sodium chloride aqueous solution) may be 25 g/g or more, may be 30 g/g or more, or may be 35 g/g or more. good.
- the upper limit of the water retention amount with respect to physiological saline (0.9% by mass sodium chloride aqueous solution) may be 55 g/g or less, may be 50 g/g or less, or may be 45 g/g or less. good.
- the water retention capacity is measured by the method described in Examples below.
- FIG. 1 is a cross-sectional view showing an example of an absorbent article.
- the absorbent article 100 shown in FIG. 1 includes a sheet-like absorbent body 10, core wraps 20a and 20b, a liquid permeable sheet 30, and a liquid impermeable sheet 40.
- the liquid impermeable sheet 40, the core wrap 20b, the absorbent body 10, the core wrap 20a, and the liquid permeable sheet 30 are laminated in this order.
- FIG. 1 there is a portion where a gap is shown between the members, but the members may be in close contact with each other without the gap.
- the absorbent body 10 has the water-absorbent resin particles 10a according to the above-described embodiment and a fiber layer 10b containing fibrous substances.
- the water absorbent resin particles 10a are dispersed in the fiber layer 10b.
- the water absorbent resin particles 10a may contain, for example, the above-described coated resin particles and other water absorbent resin particles.
- the content of the coated resin particles may be, for example, 5 parts by mass or more, or 15 parts by mass or more, or 95 parts by mass, with respect to a total of 100 parts by mass of the coated resin particles and other water-absorbent resin particles. or less, or 85 parts by mass or less.
- the core wrap 20a is arranged on one side of the absorbent body 10 (upper side of the absorbent body 10 in FIG. 1) while being in contact with the absorbent body 10.
- the core wrap 20b is arranged on the other side of the absorbent body 10 (the lower side of the absorbent body 10 in FIG. 1) in contact with the absorbent body 10.
- the absorbent body 10 is arranged between the core wrap 20a and the core wrap 20b.
- Examples of the core wraps 20a and 20b include tissue, nonwoven fabric, and the like.
- the core wrap 20a and the core wrap 20b have, for example, principal surfaces of the same size as the absorber 10. As shown in FIG.
- the liquid-permeable sheet 30 is arranged on the outermost side on the side into which the liquid to be absorbed enters.
- the liquid-permeable sheet 30 is arranged on the core wrap 20a while being in contact with the core wrap 20a.
- Examples of the liquid-permeable sheet 30 include nonwoven fabrics and porous sheets made of synthetic resins such as polyethylene, polypropylene, polyester, and polyamide.
- the liquid-impermeable sheet 40 is arranged on the outermost side of the absorbent article 100 opposite to the liquid-permeable sheet 30 .
- the liquid impermeable sheet 40 is arranged under the core wrap 20b while being in contact with the core wrap 20b.
- liquid-impermeable sheet 40 examples include sheets made of synthetic resins such as polyethylene, polypropylene, and polyvinyl chloride, sheets made of composite materials of these synthetic resins and non-woven fabric, and the like.
- the liquid permeable sheet 30 and the liquid impermeable sheet 40 have, for example, main surfaces wider than the main surface of the absorbent body 10, and the outer edges of the liquid permeable sheet 30 and the liquid impermeable sheet 40 are It extends around the absorber 10 and the core wraps 20a, 20b.
- the size relationship of the absorbent body 10, the core wraps 20a and 20b, the liquid permeable sheet 30, and the liquid impermeable sheet 40 is not particularly limited, and is appropriately adjusted according to the use of the absorbent article.
- the method of retaining the shape of the absorbent body 10 using the core wraps 20a and 20b is not particularly limited, and as shown in FIG. It's okay.
- One aspect of the present embodiment is the permeation rate of an absorbent article containing water-absorbent resin particles, including adjusting H1 and H10/H1, where Hn is the lockup height at the n-minute value of the water-absorbent resin particles. It can also be said to be a method of improving According to this method, it is possible to improve the permeation rate of the planar portion and the curved portion of the absorbent article.
- the above-described aspects can be applied to specific aspects of the method.
- hydroxyl ethyl cellulose thickener, Sumitomo Seika Co., Ltd., HEC AW-15F
- potassium persulfate water-soluble radical polymerization initiator 0.0736 g (0.272 mmol)
- ethylene glycol diglycidyl ether Internal cross-linking agent 0.0101 g (0.0580 mmol)
- ion-exchanged water 32.85 g were added and then dissolved to prepare a first-stage monomer aqueous solution.
- a reaction liquid was obtained by adding the entire amount of the second-stage monomer aqueous solution to the first-stage reaction mixture. While stirring the reaction solution, the inside of the system was sufficiently replaced with nitrogen. Thereafter, the separable flask is immersed in a water bath at 70° C. to raise the temperature of the reaction solution, and the second-stage polymerization is performed for 5 minutes to obtain a second-stage reaction mixture (polymer particles before surface cross-linking). Obtained.
- the temperature of the second-stage reaction mixture was raised in an oil bath of 125° C., and 254 g of water was added to the system by azeotropic distillation of n-heptane and water while refluxing n-heptane. pulled out. Subsequently, 0.0884 g (0.5075 mmol) of ethylene glycol diglycidyl ether was added as a surface cross-linking agent, and the mixture was maintained at 83° C. for 2 hours to obtain a dispersion of polymer particles after surface cross-linking.
- the dispersion of the polymer particles after the surface cross-linking was heated in an oil bath at 125°C to evaporate the n-heptane and dry it to obtain a dried product.
- the dried product was passed through a sieve with an opening of 850 ⁇ m to obtain 233.4 g of uncoated water absorbent resin particles (1) in the form of aggregated spherical particles.
- Example 1 The operation of Comparative Example 1 up to the addition of Tokusil was repeated, and the collected water absorbent resin particles (1) were classified with a comb having an opening of 250 ⁇ m to obtain 500 g or more of water absorbent resin particles having a particle size of 250 to 850 ⁇ m.
- Example 2 147.5 g of deionized water was added to 100.0 g of a 25% water-dispersed emulsion of ethylene-sodium acrylate copolymer (Sumitomo Seika Co., Ltd., Zaixen N) and 2.5 g of polyethylene glycol (Tokyo Chemical Industry Co., Ltd., PEG6000). to prepare a coating material B. 50.0 g of water absorbent resin particles of Example 2 having a coating layer were obtained in the same manner as in Example 1 except that the coating material B was used instead of the coating material A.
- Example 3 A coating material C was prepared by mixing 150 g of polyvinyl alcohol (Kuraray Poval 3-98), 1995.0 g of deionized water and 855.0 g of ethanol. Example 1 except that the coating material C was used instead of the coating material A, the blowing temperature of the fluidized bed granulator was set to 80 ° C., and the heating temperature in the hot air dryer was set to 140 ° C. 50.0 g of water-absorbing resin particles of Example 3 having a coating layer were obtained.
- Example 4 A coating material D was prepared by adding and mixing 25.0 g of polystyrene (Fuji Film Wako Pure Chemical Industries, Ltd.) and 475.0 g of tetrahydrofuran as a solvent. Same as Example 1, except that the coating material D was used instead of the coating material A, the blast temperature of the fluidized bed granulator was set to 40° C., and the heating with the hot air dryer was not performed. to obtain 506.6 g of water absorbent resin particles of Example 4 having a coating layer.
- polystyrene Fluji Film Wako Pure Chemical Industries, Ltd.
- Example 5 A coating material E was prepared by adding and mixing 25.0 g of palm oil (Sankei Sangyo Co., Ltd.) and 475.0 g of tetrahydrofuran as a solvent. Same as Example 1, except that the coating material E was used instead of the coating material A, the blowing temperature of the fluidized bed granulator was 40° C., and the heating with the hot air dryer was not performed. 505.5 g of the water absorbent resin particles of Example 4 having a coating layer were obtained.
- a polyol aqueous solution obtained by mixing 0.4 g of polyether polyol (EXCENOL750ED) and 7.6 g of ion-exchanged water was added to a separable flask, and then stirred at room temperature for 30 minutes. Then, after adding an isocyanate solution obtained by mixing 0.48 g of tolylene-2,4-diisocyanate and 4.30 g of acetone, the mixture was stirred at room temperature for 60 minutes to allow sequential polymerization reactions to proceed on the surfaces of the polymer particles.
- a reactant was obtained by The n-heptane was subsequently removed by evaporation by heating the reaction in a 125° C. oil bath. Then, 37.3 g of water-absorbing resin particles of Comparative Example 2 comprising polymer particles and a coating layer (polyurethane) were obtained by passing through a sieve with an opening of 850 ⁇ m.
- a coating material F was prepared by mixing 25 g of polyvinyl alcohol (Kuraray Poval 3-98), 332.5 g of deionized water and 142.5 g of ethanol.
- Example 1 except that the coating material F was used instead of the coating material A, the blast temperature of the fluidized bed granulator was 80 ° C., and the heating temperature of the hot air dryer was 140 ° C. to obtain 50.0 g of water absorbent resin particles of Comparative Example 3 having a coating layer.
- Hn [cm] Hn' - H0 Hn indicates the lockup height at the n minute value
- Hn indicates the height of the particle layer after n minutes have elapsed
- H0 indicates the height of the particle layer before 20 g of physiological saline is added.
- the measuring device Z has a burette part 71 , a conduit 72 , a flat measuring table 73 , a nylon mesh 74 , a pedestal 75 and a clamp 76 .
- the burette part 71 includes a burette 71a with a scale, a rubber plug 71b sealing an upper opening of the burette 71a, a cock 71c connected to the tip of the lower part of the burette 71a, and a lower part of the burette 71a. It has an air introduction pipe 71d and a cock 71e.
- the burette part 71 is fixed with a clamp 76 .
- the measuring table 73 has a through hole 73a with a diameter of 2 mm formed in its central portion, and is supported by a pedestal 75 whose height is variable.
- a through-hole 73 a of the measuring table 73 and a cock 71 c of the burette portion 71 are connected by a conduit 72 .
- the inner diameter of conduit 72 is 6 mm.
- the measurement was performed in an environment with a temperature of 25°C and a humidity of 50 ⁇ 10%.
- the cocks 71c and 71e of the burette part 71 were closed, and the physiological saline 77 adjusted to 25° C. was put into the burette 71a through the opening at the top of the burette 71a.
- the cocks 71c and 71e were opened.
- the inside of the conduit 72 was filled with a physiological saline solution 77 so as not to introduce air bubbles.
- the height of the measuring table 73 was adjusted so that the height of the surface of the physiological saline solution 77 reaching the inside of the through hole 73a was the same as the height of the upper surface of the measuring table 73 . After the adjustment, the height of the water surface of the physiological saline solution 77 in the burette 71a was read on the scale of the burette 71a, and the position was taken as the zero point (read value at 0 seconds).
- a nylon mesh 74 (100 mm x 100 mm, 250 mesh, thickness: about 50 ⁇ m) was laid near the through hole 73a on the measurement table 73, and a cylinder with an inner diameter of 30 mm and a height of 20 mm was placed in the center. After uniformly spraying 1.00 g of the water absorbent resin particles 78 on the cylinder, the cylinder was carefully removed to obtain a sample in which the water absorbent resin particles 78 were circularly dispersed in the center of the nylon mesh 74 .
- the nylon mesh 74 on which the water-absorbing resin particles 78 were placed was moved quickly enough to prevent the water-absorbing resin particles 78 from scattering so that the center of the nylon mesh 74 was located at the position of the through hole 73a, and the measurement was started.
- the time when air bubbles were first introduced into the burette 71a from the air introduction pipe 71d was defined as the start of water absorption (0 second).
- the amount of decrease in the physiological saline solution 77 in the burette 71a (that is, the amount of the physiological saline solution 77 absorbed by the water-absorbing resin particles 78) is sequentially read in units of 0.1 mL, and calculated from the start of water absorption of the water-absorbing resin particles 78. After 2 minutes, the weight loss Wc [g] of the physiological saline 77 was read. From Wc, the 2-minute value of no-pressure DW was obtained by the following formula.
- the non-pressurized DW is the water absorption amount per 1.00 g of the water absorbent resin particles 78 .
- Dichotomous value of non-pressurized DW [mL/g] Wc/1.00
- the mass Wa (g) of the cotton bag containing the swollen gel after dehydration was measured.
- the same operation was performed without adding the water-absorbent resin particles, and the empty weight Wb (g) of the wet cotton bag was measured, and the water retention capacity against physiological saline was calculated from the following formula.
- Water retention amount (g/g) for physiological saline [Wa-Wb]/amount of water-absorbing resin particles
- the water retention capacity of the water-absorbing resin particles of Comparative Example 1 against physiological saline was 42 g/g.
- the water-absorbing resin particles of Comparative Example 4 had a water retention capacity of 46 g/g in physiological saline.
- the resulting polymer film was cut with scissors into a 5 mm square to obtain a coating material.
- the resulting coating material was added to a similar Teflon-coated vat and covered with aluminum foil.
- the aluminum foil was perforated and dried by heating at 80° C. for 2 hours in a hot air dryer (ADVANTEC, FV-320).
- the dissolved amount of the coating layer in the water absorbent resin particles of Examples 1 and 2 was 9.8% by mass.
- Example 3 Polyvinyl alcohol (Kuraray Poval 3-98) was classified, and measurement was performed in the same manner as in Example 1 using 5 g of the coating material remaining on a sieve with an opening of 75 ⁇ m. The dissolved amount of the coating layer in the water absorbent resin particles of Example 3 and Comparative Example 4 was 22% by mass.
- Example 4 10 g of polystyrene (Fuji Film Wako Pure Chemical Industries, Ltd.) was mixed with 190 g of tetrahydrofuran to prepare a solution. After that, the temperature of the hot air dryer was changed to 40° C. to form a film, and the measurement was performed in the same manner as in Example 1 except that the film was dried. The dissolved amount of the coating layer in the water absorbent resin particles of Example 4 was 0% by mass.
- Example 5 Palm oil (Sankei Sangyo Co., Ltd.) was classified, and measurement was performed in the same manner as in Example 1 using 5 g of the coating material remaining on a sieve with an opening of 75 ⁇ m. The dissolved amount of the coating layer in the water absorbent resin particles of Example 5 was 0% by mass.
- Example 1 I covered it with aluminum foil.
- the aluminum foil was perforated and heated at 40° C. for 1 hour and then at 80° C. for 1 hour in a hot air dryer (ADVANTEC, FV-320) to form a film.
- the resulting polymer film was pulverized with a centrifugal pulverizer (ZM200, manufactured by Retsch, screen diameter: 1 mm, 6000 rpm) to obtain a powdery coating material.
- the resulting coating material was added to a similar Teflon beaker and covered with aluminum foil. Measurement was performed in the same manner as in Example 1, except that the aluminum foil was perforated, heated at 105° C. for 2 hours with a hot air dryer (ADVANTEC, FV-320), and dried.
- the dissolved amount of the coating layer in the water absorbent resin particles of Comparative Example 2 was 0% by mass.
- FIG. 4 is a scanning electron microscope (SEM) photograph of the water absorbent resin particles of Examples 1 and 2.
- FIG. 5 is a SEM photograph of the water absorbent resin particles of Examples 3-5.
- FIG. 6 is a SEM photograph of water absorbent resin particles of Comparative Examples 2 and 3.
- FIG. 4 it was confirmed that the water absorbent resin particles of Examples 1-5 and Comparative Examples 2-3 had a coating layer.
- the arrows in the SEM photographs of the water-absorbing resin particles of Examples 3 to 5 indicate the missing portions of the coating layer where the water-absorbing crosslinked polymer is exposed (portions that can function as water channels in the latter stage of water absorption).
- test solution In a container with an internal volume of 10 L, 100.0 g of sodium chloride, 3.0 g of calcium chloride dihydrate, 6.0 g of magnesium chloride hexahydrate, Triton X-100 (polyoxyethylene (10) octylphenyl ether , manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.) and 99.0 g of ion-exchanged water, and 9866.0 g of ion-exchanged water were added, and then each component was completely dissolved. A test solution was then prepared by coloring with a small amount of Blue No. 1.
- FIG. 3 is a schematic diagram showing a test method for evaluating the permeation rate of liquid in the curved portion of the absorbent body. This test was conducted under an environment of temperature 25 ⁇ 2° C. and humidity 50% ⁇ 10%.
- the U-shaped instrument 52 shown in FIG. 3 is a molded body made of acrylic resin having a curved surface 52a with a U-shaped cross section and an opening at the top.
- the curved surface 52a has an opening width W of 22 cm, a depth d of 18.5 cm, and a depth of 10 cm.
- a back sheet 53 taken from a diaper for children commercially available in Japan (Daio Paper Co., Ltd., trade name: GOO.N plus sensitive skin design, tape type L size) was placed.
- the absorbent article 100' for evaluation was adhered to the back sheet 53 with spray glue so that the central portion thereof was positioned at the deepest portion of the curved surface 52a.
- a burette 54 for introducing liquid with a capacity of 200 mL was fixed 5 cm in front of the center of the absorbent article 100' for evaluation and 1 cm above the absorbent article 100' for evaluation. 80 mL of the test liquid 51 was put into the liquid injection burette 54 and injected at a rate of 10 mL/sec.
- the time from when the test liquid 51 first reaches the evaluation absorbent article 100' to when the test liquid 51 completely disappears from the evaluation absorbent article 100' is defined as the first permeation time (seconds). did. The same operation was repeated 5 times at 30-minute intervals, and the sum of the 5 absorption rates was obtained as the permeation rate (U-shape) [sec].
- the absorbent article has a flat permeation speed of 300 seconds or less (preferably 280 seconds or less) and a U-shaped permeation speed of 800 seconds or less (preferably 700 seconds or less) based on the above measurement method. Seconds or less), the feeling of use does not change even if the wearing condition changes. It was confirmed that each example satisfies this condition.
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Abstract
Description
(1)内径2.0cm、深さ8.0cmのシリンダー内の底面全体にわたり吸水性樹脂粒子0.200gを配置して粒子層を形成し、該粒子層の高さをH0[cm]とする。
(2)粒子層に、生理食塩水20gを投入して、粒子層を膨潤させる。
(3)生理食塩水を全量投入してからn分経過したときの粒子層の高さをHn’として記録し、式:Hn’-H0で表される式からn分値におけるロックアップ高さHn[cm]を算出する。
(1)内径2.0cm、深さ8.0cmのシリンダー内の底面全体にわたり吸水性樹脂粒子0.200gを配置して粒子層を形成し、該粒子層の高さをH0[cm]とする。
(2)粒子層に、生理食塩水20gを投入して、粒子層を膨潤させる。
(3)生理食塩水を全量投入してからn分経過したときの粒子層の高さをHn’として記録し、Hn’-H0で表される式からn分値におけるロックアップ高さHn[cm]を算出する。生理食塩水は、生理食塩水の体積(mL)を基準として0.9質量%の濃度の食塩を含有する水溶液である。その他、試験条件の詳細は後述の実施例において説明される。
[比較例1]
還流冷却器、滴下ロート、窒素ガス導入管、及び、撹拌機(翼径5cmの4枚傾斜パドル翼を2段有する撹拌翼)を備えた内径11cm、容積2Lの丸底円筒型セパラブルフラスコを準備した。このセパラブルフラスコに、n-ヘプタン(炭化水素分散媒)293g、及び無水マレイン酸変性エチレン・プロピレン共重合体(高分子系分散剤、三井化学株式会社、ハイワックス1105A)0.736gを添加することにより混合物を得た。この混合物を回転数300rpmで撹拌しつつ80℃まで加温することにより分散剤を溶解させた。その後、混合物を55℃まで冷却した。
トクシールを添加する前までの比較例1の操作を繰り返し、集めた吸水性樹脂粒子(1)を目開き250μmの櫛で分級し、粒径250~850μmの吸水性樹脂粒子を500g以上入手した。
エチレン-アクリル酸ナトリウム共重合体の25%水分散エマルジョン(住友精化株式会社、ザイクセンN)100.0g、及びポリエチレングリコール(東京化成工業株式会社、PEG6000)2.5gをイオン交換水147.5gで希釈し、コーティング材Bを調製した。コーティング材Aの代わりにコーティング材Bを用いたこと以外は、実施例1と同様に作製し、コーティング層を有する実施例2の吸水性樹脂粒子50.0gを得た。
ポリビニルアルコール(クラレポバール3-98)150g、及びイオン交換水1995.0g、エタノール855.0gを混合し、コーティング材Cを調製した。コーティング材Aの代わりにコーティング材Cを用いたこと、また流動層造粒機の送風温度を80℃にしたこと、さらに熱風乾燥機での加熱温度を140℃にしたこと以外は、実施例1と同様に作製し、コーティング層を有する実施例3の吸水性樹脂粒子50.0gを得た。
ポリスチレン(富士フイルム和光純薬株式会社)25.0g、及び溶媒としてテトラヒドロフラン475.0gを加えて混合し、コーティング材Dを調製した。コーティング材Aの代わりにコーティング材Dを用いたこと、また流動層造粒機の送風温度を40℃にしたこと、さらに熱風乾燥機での加熱を行わなかったこと以外は、実施例1と同様に作製し、コーティング層を有する実施例4の吸水性樹脂粒子506.6gを得た。
パーム油(山桂産業株式会社)25.0g、及び溶媒としてテトラヒドロフラン475.0gを加えて混合し、コーティング材Eを調製した。コーティング材Aの代わりにコーティング材Eを用いたこと、また流動層造粒機の送風温度を40℃としたこと、さらに熱風乾燥機での加熱を行わなかったこと以外は、実施例1と同様に作製し、コーティング層を有する実施例4の吸水性樹脂粒子505.5gを得た。
還流冷却器、滴下ロート、窒素ガス導入管、及び撹拌機(翼径50mmの4枚傾斜パドル翼を2段有する撹拌翼)を備えた内径110mm、内容積2Lの丸底円筒型セパラブルフラスコを準備した。このセパラブルフラスコに、比較例1で作製した吸水性樹脂粒子(1)を40gとn-ヘプタン480gとを混合した。
ポリビニルアルコール(クラレポバール3-98)25g、及びイオン交換水332.5g、エタノール142.5gを混合し、コーティング材Fを調製した。コーティング材Aの代わりにコーティング材Fを用いたこと、また流動層造粒機の送風温度を80℃としたこと、さらに熱風乾燥機での加熱温度を140℃にしたこと以外は、実施例1と同様に作製し、コーティング層を有する比較例3の吸水性樹脂粒子50.0gを得た。
第1段目のモノマー水溶液を調製する際、エチレングリコールジグリシジルエーテル(内部架橋剤)の添加量を0.00828g(0.0475ミリモル)としたこと、n-ヘプタンと水との共沸蒸留により、n-ヘプタンを還流しながら260gの水を系外へ抜き出したこと、また添加するトクシールの量を1.0gとした以外は比較例1と同様に作製し、吸水性樹脂粒子(3)233.6gを得た。
上述した方法によって得られた実施例及び比較例の吸水性樹脂粒子0.200gを精秤し、内径2.0cm、深さ8.0cmのアクリルシリンダーの底に敷き詰め、粒子層の高さH0を測定した。その後、生理食塩水20gを量り取り、アクリルシリンダー上部から注ぎこんだ。生理食塩水を全量入れた時点から測定を開始し、1分後の粒子層の高さH1’、5分後の高さH5’、10分後の高さH10’を読み取り、以下の式よりn分値におけるロックアップ高さ[cm]を算出した。
Hn[cm]=Hn’-H0
Hnは、n分値におけるロックアップ高さを示し、Hnは、n分経過したときの粒子層の高さを示し、H0は生理食塩水20gを投入する前の粒子層の高さを示す。
上述した方法によって得られた実施例及び比較例の吸水性樹脂粒子の無加圧DWは、図2に示す測定装置Zを用いて測定した。
無加圧DWの2分値[mL/g]=Wc/1.00
測定は、25℃、湿度50%の環境下で行った。比較例1又は比較例4の吸水性樹脂粒子2.00gを、綿袋(メンブロード60番、横100mm×縦200mm)に入れ、500ml容のビーカー中で0.9%生理食塩水500gを上述綿袋に入れ、綿袋の上部を輪ゴムで縛り、30分間静置し膨潤させた。その後、遠心力が167Gとなるよう設定した脱水機(株式会社コクサン製、品番:H-122)を用いて1分間脱水した。脱水後の膨潤ゲルを含んだ綿袋の質量Wa(g)を測定した。吸水性樹脂粒子を添加せずに同様の操作を行い、綿袋の湿潤時の空質量Wb(g)を測定し、以下の式から生理食塩水に対する保水量を算出した。
生理食塩水に対する保水量(g/g)=[Wa-Wb]/吸水性樹脂粒子の量
(実施例1、2)
200mLポリビーカーに、エチレン-アクリル酸ナトリウム共重合体の25%水分散エマルジョン(住友精化株式会社、ザイクセンN)100g、及びポリエチレングリコール(東京化成工業株式会社、PEG6000)2.5g加え、混合液を調製した。その後、底寸法250×185(mm)のテフロンコーティングバットに、混合液を入れアルミホイルを被せて蓋をした。アルミホイルに穿孔し、熱風乾燥機(ADVANTEC、FV―320)にて80℃で加熱して、製膜した。
ろ液100gの場合の析出量(Wb)(g)=(Wa/60)×100
溶解分(質量%)=(Wb/5)×100
ポリビニルアルコール(クラレポバール3-98)を分級し、目開き75μmの篩上に残ったコーティング材料5gを用いて、実施例1と同様に測定を行った。実施例3及び比較例4の吸水性樹脂粒子におけるコーティング層の溶解分は、22質量%であった。
ポリスチレン(富士フイルム和光純薬株式会社)10gをテトラヒドロフラン190gと混合し、溶液を調製した。その後熱風乾燥機の温度を40℃に変更して成膜し、乾燥させたこと以外は実施例1と同様に測定を行った。実施例4の吸水性樹脂粒子におけるコーティング層の溶解分は、0質量%であった。
パーム油(山桂産業株式会社)を分級し、目開き75μmの篩上に残ったコーティング材料5gを用いて、実施例1と同様に測定を行った。実施例5の吸水性樹脂粒子におけるコーティング層の溶解分は、0質量%であった。
モノマー種Aの溶液として、ポリエーテルポリオール(AGC株式会社製、EXCENOL750ED)9.2g及びアセトン27.6gの混合液(ポリオール溶液)36.8gを調製した。また、モノマー種Bの溶液として、トリレン-2,4-ジイソシアナート10.8g及びアセトン32.4gの混合液(イソシアネート溶液)43.2gを調製した。
図4は実施例1~2の吸水性樹脂粒子の走査型電子顕微鏡(SEM)写真である。図5は実施例3~5の吸水性樹脂粒子のSEM写真である。図6は比較例2~3の吸水性樹脂粒子のSEM写真である。図4~6に示すとおり、実施例1~5及び比較例2~3の吸水性樹脂粒子は、コーティング層を有することが確認された。実施例3~5の吸水性樹脂粒子のSEM写真中の矢印は、吸水性を有する架橋重合体が露出しているコーティング層の欠損部(吸水後期において水路として機能し得る部分)を示す。実施例1及び2の吸水性樹脂粒子のSEM写真において欠損部は確認されなかったが、吸水性樹脂粒子が水と接触すると、コーティング層を構成するポリエチレングリコール(易水溶性部分)が溶出して事後的に欠損部が形成されると推測される。
実施例1~5及び比較例1~4の吸水性樹脂粒子を用いて作製された吸収体についてフラット試験、U字試験の浸透速度を評価した。
比較例1で作製した吸水性樹脂粒子(2)を9.6g、実施例1~5及び比較例2~3で作製した被覆樹脂粒子2.4gの計12gを混合した粒子を吸収体で使用した。また、比較例1の吸収体では吸水性樹脂粒子(2)を、比較例4の吸収体では吸水性樹脂粒子(3)を混合せずに単独で12g使用した。
上記で混合した吸収体評価用樹脂粒子12g及び解砕パルプ(Rayonier社製、商品名:Rayfloc)8.0gを空気抄造によって均一混合することにより、40cm×12cmの大きさの吸収体コアを作製した。次に、吸収体コアと同じ大きさの2枚のティッシュッペーパー(坪量:16g/m2)で吸収体コアの上下を挟んだ状態で、全体に141kPaの荷重を30秒間加えてプレスすることにより吸収体(粒子含有量:60質量%)を作製した。
上述の吸収体の上面に、吸収体と同じ大きさで、ポリエチレン製エアスルー型多孔質液体透過性シート(坪量:22g/m2)を配置し、下面に吸収体と同じ大きさで、ポリエチレン製液体不透過性シート(坪量:22g/m2)を配置して、吸収体を挟みつけることにより評価用吸収性物品を得た。
内容積10Lの容器に、塩化ナトリウム100.0gと、塩化カルシウム二水和物3.0gと、塩化マグネシウム六水和物6.0gと、トリトンX-100(ポリオキシエチレン(10)オクチルフェニルエーテル、富士フィルム和光純薬株式会社製)1.0g及びイオン交換水99.0gの混合物と、イオン交換水9866.0gと、を入れた後、各成分を完全に溶解させた。次に、少量の青色1号で着色することにより試験液を調製した。
まず、水平の台上に評価用吸収性物品を置いた。評価用吸収性物品の中心部に、内径3cmの開口部を有する液投入用シリンダーを置き、上述の試験液80mLをそのシリンダー内に一度に投入し、吸収速度を測定した。同様の操作を30分間隔で計5回行い、5回の吸収速度の合計を浸透速度(フラット)[秒]として得た。
図3は、吸収体の湾曲した部分における液の浸透速度を評価するための試験方法を示す模式図である。この試験は、温度25±2℃、湿度50%±10%の環境下で行った。図3に示すU字型器具52は、上方に開口部を有する断面U字型の湾曲面52aを有するアクリル樹脂製の成形体である。湾曲面52aは、22cmの開口幅W、18.5cmの深さd、及び10cmの奥行きを有する。湾曲面52a上に、日本国内で市販されている子供用のおむつ(大王製紙株式会社、商品名:GOO.Nプラス敏感肌設計、テープタイプLサイズ)から採取したバックシート53を載せた。バックシート53の上に、評価用吸収性物品100’を、その中心部が湾曲面52aの最深部に位置するようにスプレーグルーで張り付けた。評価用吸収性物品100’の中心部から5cm前かつ、評価用吸収性物品100’上から1cm上に、容量200mLの液投入用ビュレット54を固定した。液投入用ビュレット54に、80mLの試験液51を入れ、10mL/秒の速度で投入した。試験液51が最初に評価用吸収性物品100’に到達した時点から、試験液51が評価用吸収性物品100’上から完全に消失するまでの時間を、1回目の浸透時間(秒)とした。同様の操作を30分間隔で計5回行い、5回の吸収速度の合計を浸透速度(U字)[秒]として得た。
Claims (8)
- n分値におけるロックアップ高さがHn[cm]であるとき、H1が1.0cm以下であり、かつ、H10/H1が5.0以上であり、
前記n分値におけるロックアップ高さが、下記手順により測定される、吸水性樹脂粒子。
(1)内径2.0cm、深さ8.0cmのシリンダー内の底面全体にわたり吸水性樹脂粒子0.200gを配置して粒子層を形成し、該粒子層の高さをH0[cm]とする。
(2)前記粒子層に、生理食塩水20gを投入して、前記粒子層を膨潤させる。
(3)生理食塩水を全量投入してからn分経過したときの前記粒子層の高さをHn’として記録し、式:Hn’-H0で表される式からn分値におけるロックアップ高さHn[cm]を算出する。 - 無加圧DWの2分値が15.0以下である、請求項1に記載の吸水性樹脂粒子。
- 重合体粒子と、前記重合体粒子の表面の少なくとも一部を被覆するコーティング層とを有する被覆樹脂粒子である、請求項1又は2に記載の吸水性樹脂粒子。
- 前記コーティング層が難水溶性のコーティング層である、請求項3に記載の吸水性樹脂粒子。
- 請求項1~4のいずれか一項に記載の吸水性樹脂粒子と、前記吸水性樹脂粒子以外のその他の吸水性樹脂粒子と、を含む、吸水性樹脂組成物。
- 請求項1~4のいずれか一項に記載の吸水性樹脂粒子、又は請求項5に記載の吸水性樹脂組成物を含有する、吸収体。
- 請求項6に記載の吸収体を備える、吸収性物品。
- おむつである、請求項7に記載の吸収性物品。
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56115259A (en) * | 1980-02-19 | 1981-09-10 | Kuraray Co | Surface coated high water absorbing resin molding |
JPS56159232A (en) * | 1980-05-12 | 1981-12-08 | Kuraray Co Ltd | Powdery high water-absorption resin for surface coating |
JPS57168921A (en) * | 1981-04-10 | 1982-10-18 | Sumitomo Chem Co Ltd | Production of highly water-absorbing polymeric material having improved water-absorption rate |
JPH01261250A (ja) * | 1988-04-08 | 1989-10-18 | Tsuruga Cement Kk | 高吸水性樹脂を用いたセメント・コンクリートおよびモルタルの混和材料 |
JPH02242858A (ja) * | 1989-03-16 | 1990-09-27 | Sanyo Chem Ind Ltd | 吸水剤およびその製造方法 |
JPH03285918A (ja) * | 1990-03-31 | 1991-12-17 | Tokai Rubber Ind Ltd | 吸水性樹脂の製法 |
JPH11347402A (ja) * | 1998-04-10 | 1999-12-21 | Sanyo Chem Ind Ltd | 吸水剤及びその製法 |
JP2014046020A (ja) | 2012-08-31 | 2014-03-17 | Livedo Corporation | 吸収体、および、これを用いた吸収性物品 |
-
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- 2022-04-14 US US18/561,121 patent/US20240253015A1/en active Pending
- 2022-04-14 WO PCT/JP2022/017873 patent/WO2022244567A1/ja active Application Filing
- 2022-04-14 EP EP22804481.4A patent/EP4324867A1/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56115259A (en) * | 1980-02-19 | 1981-09-10 | Kuraray Co | Surface coated high water absorbing resin molding |
JPS56159232A (en) * | 1980-05-12 | 1981-12-08 | Kuraray Co Ltd | Powdery high water-absorption resin for surface coating |
JPS57168921A (en) * | 1981-04-10 | 1982-10-18 | Sumitomo Chem Co Ltd | Production of highly water-absorbing polymeric material having improved water-absorption rate |
JPH01261250A (ja) * | 1988-04-08 | 1989-10-18 | Tsuruga Cement Kk | 高吸水性樹脂を用いたセメント・コンクリートおよびモルタルの混和材料 |
JPH02242858A (ja) * | 1989-03-16 | 1990-09-27 | Sanyo Chem Ind Ltd | 吸水剤およびその製造方法 |
JPH03285918A (ja) * | 1990-03-31 | 1991-12-17 | Tokai Rubber Ind Ltd | 吸水性樹脂の製法 |
JPH11347402A (ja) * | 1998-04-10 | 1999-12-21 | Sanyo Chem Ind Ltd | 吸水剤及びその製法 |
JP2014046020A (ja) | 2012-08-31 | 2014-03-17 | Livedo Corporation | 吸収体、および、これを用いた吸収性物品 |
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CN117337315A (zh) | 2024-01-02 |
JPWO2022244567A1 (ja) | 2022-11-24 |
EP4324867A1 (en) | 2024-02-21 |
US20240253015A1 (en) | 2024-08-01 |
KR20240009959A (ko) | 2024-01-23 |
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