JP2006016719A5 - - Google Patents
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- Publication number
- JP2006016719A5 JP2006016719A5 JP2004194855A JP2004194855A JP2006016719A5 JP 2006016719 A5 JP2006016719 A5 JP 2006016719A5 JP 2004194855 A JP2004194855 A JP 2004194855A JP 2004194855 A JP2004194855 A JP 2004194855A JP 2006016719 A5 JP2006016719 A5 JP 2006016719A5
- Authority
- JP
- Japan
- Prior art keywords
- monomer
- fiber assembly
- tow
- fiber
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 239000000835 fiber Substances 0.000 claims description 110
- 239000000178 monomer Substances 0.000 claims description 89
- 239000002250 absorbent Substances 0.000 claims description 52
- 230000002745 absorbent Effects 0.000 claims description 51
- 239000007788 liquid Substances 0.000 claims description 44
- 239000002131 composite material Substances 0.000 claims description 39
- 229920000247 Superabsorbent polymer Polymers 0.000 claims description 32
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 230000000379 polymerizing Effects 0.000 claims description 10
- 238000006116 polymerization reaction Methods 0.000 description 30
- 229920005989 resin Polymers 0.000 description 22
- 239000011347 resin Substances 0.000 description 22
- 229920002678 cellulose Polymers 0.000 description 18
- 238000010521 absorption reaction Methods 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- -1 pulp Substances 0.000 description 13
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 11
- 238000007906 compression Methods 0.000 description 11
- 239000007864 aqueous solution Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 210000002700 Urine Anatomy 0.000 description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-M acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 9
- 229940048053 acrylate Drugs 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000003999 initiator Substances 0.000 description 8
- 239000003505 polymerization initiator Substances 0.000 description 8
- 239000011780 sodium chloride Substances 0.000 description 7
- 239000001913 cellulose Substances 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 6
- 238000002788 crimping Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 5
- 239000007870 radical polymerization initiator Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 5
- ROOXNKNUYICQNP-UHFFFAOYSA-N Ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 4
- 229920002301 Cellulose acetate Polymers 0.000 description 4
- MTHSVFCYNBDYFN-UHFFFAOYSA-N Diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 4
- 239000004698 Polyethylene (PE) Substances 0.000 description 4
- CHQMHPLRPQMAMX-UHFFFAOYSA-L Sodium persulfate Chemical compound [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 4
- 238000007792 addition Methods 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 239000004745 nonwoven fabric Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- DNIAPMSPPWPWGF-UHFFFAOYSA-N propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 4
- 230000002829 reduced Effects 0.000 description 4
- 238000005979 thermal decomposition reaction Methods 0.000 description 4
- 229920005992 thermoplastic resin Polymers 0.000 description 4
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 4
- 239000004952 Polyamide Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 230000000717 retained Effects 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- AOBIOSPNXBMOAT-UHFFFAOYSA-N 2-[2-(oxiran-2-ylmethoxy)ethoxymethyl]oxirane Chemical compound C1OC1COCCOCC1CO1 AOBIOSPNXBMOAT-UHFFFAOYSA-N 0.000 description 2
- HCLJOFJIQIJXHS-UHFFFAOYSA-N 2-[2-[2-(2-prop-2-enoyloxyethoxy)ethoxy]ethoxy]ethyl prop-2-enoate Chemical compound C=CC(=O)OCCOCCOCCOCCOC(=O)C=C HCLJOFJIQIJXHS-UHFFFAOYSA-N 0.000 description 2
- 210000001124 Body Fluids Anatomy 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 Chemical class O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- URAYPUMNDPQOKB-UHFFFAOYSA-N Triacetin Chemical compound CC(=O)OCC(OC(C)=O)COC(C)=O URAYPUMNDPQOKB-UHFFFAOYSA-N 0.000 description 2
- 229960002622 Triacetin Drugs 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive Effects 0.000 description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 2
- 239000010839 body fluid Substances 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 235000011187 glycerol Nutrition 0.000 description 2
- 239000001087 glyceryl triacetate Substances 0.000 description 2
- 235000013773 glyceryl triacetate Nutrition 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 229920002689 polyvinyl acetate Polymers 0.000 description 2
- 239000011118 polyvinyl acetate Substances 0.000 description 2
- 239000004627 regenerated cellulose Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 230000002522 swelling Effects 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- CIWBSHSKHKDKBQ-DUZGATOHSA-N (+)-Ascorbic acid Natural products OC[C@@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-DUZGATOHSA-N 0.000 description 1
- QNODIIQQMGDSEF-UHFFFAOYSA-N (1-hydroxycyclohexyl)-phenylmethanone Chemical compound C=1C=CC=CC=1C(=O)C1(O)CCCCC1 QNODIIQQMGDSEF-UHFFFAOYSA-N 0.000 description 1
- HKQOBOMRSSHSTC-DIBAFDJWSA-N (2R,3S,4S,5R,6S)-2-(hydroxymethyl)-6-[(2R,3S,4R,5R,6R)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxane-3,4,5-triol;[(2R,3R,4S,5R,6S)-4,5,6-triacetyloxy-3-[(2S,3R,4S,5R,6R)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyoxan-2-yl]methyl acetate;[( Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@@H](O)[C@H](O)[C@H]1O.CC(=O)OC[C@H]1O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](OC(C)=O)[C@@H]1O[C@H]1[C@H](OC(C)=O)[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1.CCC(=O)OC[C@H]1O[C@@H](OC(=O)CC)[C@H](OC(=O)CC)[C@@H](OC(=O)CC)[C@@H]1O[C@H]1[C@H](OC(=O)CC)[C@@H](OC(=O)CC)[C@H](OC(=O)CC)[C@@H](COC(=O)CC)O1 HKQOBOMRSSHSTC-DIBAFDJWSA-N 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N 1,2-ethanediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 description 1
- GUOSQNAUYHMCRU-UHFFFAOYSA-N 11-Aminoundecanoic acid Chemical compound NCCCCCCCCCCC(O)=O GUOSQNAUYHMCRU-UHFFFAOYSA-N 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- BJELTSYBAHKXRW-UHFFFAOYSA-N 2,4,6-tris(prop-2-enoxy)-1,3,5-triazine Chemical compound C=CCOC1=NC(OCC=C)=NC(OCC=C)=N1 BJELTSYBAHKXRW-UHFFFAOYSA-N 0.000 description 1
- OVOUKWFJRHALDD-UHFFFAOYSA-N 2-[2-(2-acetyloxyethoxy)ethoxy]ethyl acetate Chemical compound CC(=O)OCCOCCOCCOC(C)=O OVOUKWFJRHALDD-UHFFFAOYSA-N 0.000 description 1
- AWKXKNCCQLNZDB-UHFFFAOYSA-N 2-[2-(2-propanoyloxyethoxy)ethoxy]ethyl propanoate Chemical compound CCC(=O)OCCOCCOCCOC(=O)CC AWKXKNCCQLNZDB-UHFFFAOYSA-N 0.000 description 1
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 1
- 210000001015 Abdomen Anatomy 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
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- ISAOCJYIOMOJEB-UHFFFAOYSA-N Benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 description 1
- 229960002130 Benzoin Drugs 0.000 description 1
- RWCCWEUUXYIKHB-UHFFFAOYSA-N Benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 1
- 229920000623 Cellulose acetate phthalate Polymers 0.000 description 1
- DJHJJVWPFGHIPH-OODMECLYSA-N Chitin Chemical compound O[C@@H]1C(NC(=O)C)[C@H](O)OC(CO)[C@H]1COC[C@H]1C(NC(C)=O)[C@@H](O)[C@H](COC[C@H]2C([C@@H](O)[C@H](O)C(CO)O2)NC(C)=O)C(CO)O1 DJHJJVWPFGHIPH-OODMECLYSA-N 0.000 description 1
- 229920002101 Chitin Polymers 0.000 description 1
- 229920001661 Chitosan Polymers 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- YQHLDYVWEZKEOX-UHFFFAOYSA-N Cumene hydroperoxide Chemical compound OOC(C)(C)C1=CC=CC=C1 YQHLDYVWEZKEOX-UHFFFAOYSA-N 0.000 description 1
- 239000004641 Diallyl-phthalate Substances 0.000 description 1
- DOIRQSBPFJWKBE-UHFFFAOYSA-N Dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 1
- HECLRDQVFMWTQS-UHFFFAOYSA-N Dicyclopentadiene Chemical compound C1C2C3CC=CC3C1C=C2 HECLRDQVFMWTQS-UHFFFAOYSA-N 0.000 description 1
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- USHAGKDGDHPEEY-UHFFFAOYSA-L Potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
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- AKHNMLFCWUSKQB-UHFFFAOYSA-L Sodium thiosulphate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
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- DQEFEBPAPFSJLV-WLTGXWPBSA-N [(2R,3R,4S,5R,6S)-4,5,6-tri(propanoyloxy)-3-[(2S,3R,4S,5R,6R)-3,4,5-tri(propanoyloxy)-6-(propanoyloxymethyl)oxan-2-yl]oxyoxan-2-yl]methyl propanoate Chemical compound CCC(=O)OC[C@H]1O[C@@H](OC(=O)CC)[C@H](OC(=O)CC)[C@@H](OC(=O)CC)[C@@H]1O[C@H]1[C@H](OC(=O)CC)[C@@H](OC(=O)CC)[C@H](OC(=O)CC)[C@@H](COC(=O)CC)O1 DQEFEBPAPFSJLV-WLTGXWPBSA-N 0.000 description 1
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2S,3R,4S,5R,6R)-2-[(2R,3R,4S,5R,6S)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2R,3R,4S,5R,6S)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 1
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- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 1
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- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
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- DWAQJAXMDSEUJJ-UHFFFAOYSA-M sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
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Description
本発明は、紙おむつ、生理用ナプキン等の製造に有用な吸収性複合体の製造方法に関するものである。 The present invention relates to a method for producing an absorptive composite useful for producing disposable diapers, sanitary napkins and the like.
従来、紙おむつ、生理用ナプキン等に用いられる吸収性複合体は、一般に紙、パルプ、不織布等の短繊維からなる繊維集合体上に、架橋したポリアクリル酸等の吸水性樹脂粉末を均一に分散させ、固着させて製造されている。しかし、この製造方法による場合は、繊維集合体に吸水性樹脂粉末を確実に固着し難い。また粉末を取扱う点で操作が煩雑である。 Conventionally, absorbent composites used for paper diapers, sanitary napkins, etc. are generally uniformly dispersed with a water absorbent resin powder such as cross-linked polyacrylic acid on a fiber assembly composed of short fibers such as paper, pulp, and nonwoven fabric. And are made to adhere. However, according to this manufacturing method, it is difficult to reliably adhere the water absorbent resin powder to the fiber assembly. Also, the operation is complicated in that the powder is handled.
上記問題を解決するため、アクリル酸及びアクリル酸塩からなる単量体混合物水溶液を繊維集合体に噴霧した後、これに電離放射線や微粒子イオン化放射線等を照射することにより、噴霧した単量体混合物を重合させて吸水性樹脂を繊維集合体に固着させる方法が知られている（例えば、特許文献１〜３参照）。 In order to solve the above problem, after spraying the monomer mixture aqueous solution composed of acrylic acid and acrylate onto the fiber assembly, the sprayed monomer mixture is irradiated with ionizing radiation, fine particle ionizing radiation, etc. A method is known in which water-absorbent resin is fixed to a fiber assembly by polymerizing the polymer (for example, see Patent Documents 1 to 3).
しかしながら、従来の吸収性複合体では、高吸収性ポリマーの使用量の割りには吸収性能が不十分になるといった問題点があった。
そこで、本発明の主たる課題は、高吸収性ポリマーの吸収能力を十分に発揮させることができる技術を提供することにある。 Then, the main subject of this invention is providing the technique which can fully exhibit the absorption capability of a superabsorbent polymer.
上記課題について本発明者らが鋭意研究したところ、従来の吸収性複合体は空隙が小さく、かつ繊維相互が比較的強固に交差し、絡み合っているために、高吸収性ポリマーが液を吸収して膨張するのに十分な容積がなく、また繊維相互の拘束力を超えて膨張することが困難であることが判明した。これでは、高吸収性ポリマーの使用量の割りには吸収性能が不十分になってしまう。以下の本発明は、このような知見に基づいてなされたものである。 When the present inventors diligently researched about the above-mentioned problem, the conventional absorbent composite has a small gap, and the fibers are relatively tightly crossed and entangled with each other. Therefore, the superabsorbent polymer absorbs the liquid. It has been found that there is not enough volume to expand and it is difficult to expand beyond the binding forces between the fibers. This makes the absorption performance insufficient for the amount of superabsorbent polymer used. The following present invention has been made based on such findings.
＜請求項１記載の発明＞
トウからなる繊維集合体に、高吸収性ポリマーの単量体を含む液を保持させた後、この単量体を重合させることを特徴とする吸収性複合体の製造方法。
<Invention of Claim 1>
A method for producing an absorptive composite, comprising: holding a liquid containing a monomer of a superabsorbent polymer in a fiber assembly made of tow, and then polymerizing the monomer.
（作用効果）
本発明は、繊維集合体に、高吸収性ポリマーの単量体を含む液を保持させた後、この単量体を重合させるにあたり、敢えてトウ（繊維束）からなる繊維集合体を用いたものである。トウからなる繊維集合体は短繊維のものよりも嵩高にすることができるため、高吸収性ポリマーの膨潤に十分な空隙を確保できるとともに、繊維相互の絡み合いが少なく、高吸収性ポリマーの膨張に応じて空隙が広がる（膨張する）ことができる。よって、従来のような吸収阻害が発生し難くなり、高吸収性ポリマーが本来有する吸収能力を十分に発揮させることができるようになる。
(Function and effect)
The present invention uses a fiber assembly made of tows (fiber bundles) in order to polymerize the monomer after holding the liquid containing the superabsorbent polymer monomer in the fiber assembly. It is. Since the fiber aggregate made of tow can be made bulkier than that of short fibers, it is possible to secure sufficient voids for swelling of the superabsorbent polymer, and there is less entanglement between the fibers, which leads to expansion of the superabsorbent polymer. Correspondingly, the voids can expand (expand). Therefore, the conventional absorption inhibition is less likely to occur, and the absorption capability inherent to the superabsorbent polymer can be sufficiently exhibited.
一方、トウは連続繊維であるため、例えば一般的な吸収体のように短繊維と高吸収性ポリマー粒子とを混合積繊するような製造手法を採ることができず、トウからなる繊維集合体に高吸収性ポリマー粒子を散布しても、高吸収性ポリマー粒子を繊維集合体内全体に均一に分散させ且つ保持させるのは不可能に近い。これに対して、本発明では、繊維集合体内部に液体の単量体が容易に分散され、その後に高吸収性ポリマーとなるため、高吸収性ポリマーを繊維集合体内全体に均一に保持させることができる。 On the other hand, since tow is a continuous fiber, for example, it is not possible to adopt a production method in which short fibers and superabsorbent polymer particles are mixed and mixed like a general absorbent, and a fiber assembly made of tow. Even if the superabsorbent polymer particles are sprayed on it, it is almost impossible to uniformly disperse and hold the superabsorbent polymer particles throughout the fiber assembly. On the other hand, in the present invention, since the liquid monomer is easily dispersed inside the fiber assembly and then becomes a superabsorbent polymer, the superabsorbent polymer is uniformly held throughout the fiber assembly. Can do.
＜請求項２記載の発明＞
単量体を含む液を保持させた後であって、単量体を重合させる前のトウからなる繊維集合体に外力を加える、請求項１記載の吸収性複合体の製造方法。
<Invention of Claim 2>
The method for producing an absorbent composite according to claim 1, wherein an external force is applied to the fiber assembly made of tow after the liquid containing the monomer is held and before the monomer is polymerized.
（作用効果）
このように、単量体液を繊維集合体に保持させると、一部の単量体液は繊維間に跨って膜状に保持される。これをそのまま重合させると繊維相互が高吸収性ポリマーを介して接合され、繊維間空隙が減少するとともに、繊維間空隙の膨張が困難になる。これに対して本項記載のように、単量体液保持後かつ重合前に捲縮加工等による外力を加えると、上記膜状化が解消され、繊維間に跨って膜状に保持されていた単量体液は繊維表面に移動し、繊維間に空隙が形成され、そして、この状態で重合が行われる。よって、最大限の繊維間空隙を確実かつ容易に確保できるとともに、繊維間空隙の膨張も阻害され難くなる。
(Function and effect)
As described above, when the monomer liquid is held in the fiber assembly, a part of the monomer liquid is held in a film shape across the fibers. When this is polymerized as it is, the fibers are bonded to each other via the superabsorbent polymer, the inter-fiber voids are reduced, and the inter-fiber voids are difficult to expand. On the other hand, as described in this section, when an external force is applied after crimping or the like after holding the monomer liquid and before polymerization, the film formation is eliminated and the film is held between the fibers. The monomer liquid moves to the fiber surface, voids are formed between the fibers, and polymerization is performed in this state. Therefore, the maximum inter-fiber gap can be ensured reliably and easily, and the expansion of the inter-fiber gap is hardly inhibited.
＜請求項３記載の発明＞
トウからなる繊維集合体に、高吸収性ポリマーの単量体を含む液を保持させた後、この単量体を重合させてなることを特徴とする吸収性複合体。
<Invention of Claim 3>
An absorbent composite comprising: a fiber assembly made of tow, a liquid containing a superabsorbent polymer monomer, and then polymerizing the monomer.
（作用効果）
請求項１記載の発明と同様の作用効果が奏せられる。
(Function and effect)
The same effect as that of the first aspect of the invention can be achieved.
＜請求項４記載の発明＞
トウからなる繊維集合体に、高吸収性ポリマーの単量体を含む液を保持させた後、この単量体を重合させてなる吸収性複合体を備えたことを特徴とする吸収性物品。
<Invention of Claim 4>
An absorbent article comprising an absorbent composite formed by holding a liquid containing a monomer of a superabsorbent polymer in a fiber assembly made of tow and then polymerizing the monomer.
（作用効果）
請求項１記載の発明と同様の作用効果が奏せられる。
(Function and effect)
The same effect as that of the first aspect of the invention can be achieved.
以上のとおり本発明によれば、高吸収性ポリマーが本来有する吸収能力を十分に発揮させることができるようになる。 As described above, according to the present invention, the absorption capability inherent to the superabsorbent polymer can be sufficiently exhibited.
以下、本発明の一実施の形態について添付図面を参照しつつ詳説する。
図１は、本発明に係る吸収性複合体の製造方法を示しており、主に、連続的に供給される帯状のトウからなる繊維集合体１０に、高吸収性ポリマーの単量体を含む液（以下、単量体液ともいう）を保持させる第一工程と、繊維集合体に保持させた単量体を重合させる第二工程とから構成される。
Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows a method for producing an absorbent composite according to the present invention, in which a fiber assembly 10 consisting mainly of a strip-like tow that is continuously supplied contains a superabsorbent polymer monomer. A first step of holding a liquid (hereinafter also referred to as a monomer solution) and a second step of polymerizing the monomer held in the fiber assembly.
（第一工程について）
第一工程では、連続帯状のトウからなる繊維集合体１０が供給される。本発明におけるトウからなる繊維集合体１０としては次のようなものが好適に用いられる。すなわち、本発明に用いる繊維集合体１０のトウを構成する繊維としては、例えば、多糖類又はその誘導体（セルロース、セルロースエステル、キチン、キトサンなど）、合成高分子（ポリエチレン、ポリプロピレン、ポリアミド、ポリエステル、ポリラクタアミド、ポリビニルアセテートなど）などを用いることができるが、特に、セルロースエステルおよびセルロースが好ましい。
(About the first step)
In the first step, a fiber assembly 10 made of continuous belt-shaped tows is supplied. As the fiber assembly 10 made of tow in the present invention, the following is preferably used. That is, as the fibers constituting the tow of the fiber assembly 10 used in the present invention, for example, polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, Polylactamides, polyvinyl acetate, etc.) can be used, and cellulose esters and cellulose are particularly preferable.
セルロースとしては、綿、リンター、木材パルプなど植物体由来のセルロースやバクテリアセルロースなどが使用でき、レーヨンなどの再生セルロースであってもよく、再生セルロースは紡糸された繊維であってもよい。セルロースの形状と大きさは、実質的に無限長とみなし得る連続繊維から長径が数ミリ〜数センチ（例えば、１ｍｍ〜５ｃｍ）程度のもの、粒径が数ミクロン（例えば、１〜１００μｍ）程度の微粉末状のものまで、様々な大きさから選択できる。セルロースは、叩解パルプなどのように、フィブリル化していてもよい。 As cellulose, cellulose derived from plants such as cotton, linter, and wood pulp, bacterial cellulose, and the like can be used. Regenerated cellulose such as rayon may be used, and the regenerated cellulose may be a spun fiber. The shape and size of cellulose is a continuous fiber that can be regarded as a substantially infinite length and has a long diameter of several millimeters to several centimeters (for example, 1 mm to 5 cm), and a particle diameter of about several microns (for example, 1 to 100 μm). Can be selected from various sizes up to a fine powder. Cellulose may be fibrillated, such as beaten pulp.
セルロースエステルとしては、例えば、セルロースアセテート、セルロースブチレート、セルロースプロピオネートなどの有機酸エステル；セルロースアセテートプロピオネート、セルロースアセテートブチレート、セルロースアセテートフタレート、硝酸酢酸セルロースなどの混酸エステル；およびポリカプロラクトングラフト化セルロースエステルなどのセルロースエステル誘導体などを用いることができる。これらのセルロースエステルは単独で又は二種類以上混合して使用できる。セルロースエステルの粘度平均重合度は、例えば、５０〜９００、好ましくは２００〜８００程度である。セルロースエステルの平均置換度は、例えば、１．５〜３．０（例えば、２〜３）程度である。 Examples of cellulose esters include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; mixed acid esters such as cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, and cellulose nitrate acetate; and polycaprolactone Cellulose ester derivatives such as grafted cellulose ester can be used. These cellulose esters can be used alone or in admixture of two or more. The viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800. The average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).
セルロースエステルの平均重合度は、例えば１０〜１０００、好ましくは５０〜９００、さらに好ましくは２００〜８００程度とすることができ、セルロースエステルの平均置換度は、例えば１〜３程度、好ましくは１〜２．１５、さらに好ましくは１．１〜２．０程度とすることができる。セルロースエステルの平均置換度は、生分解性を高める等の観点から選択することができる。 The average degree of polymerization of the cellulose ester can be, for example, 10 to 1000, preferably 50 to 900, more preferably about 200 to 800, and the average degree of substitution of the cellulose ester is, for example, about 1 to 3, preferably 1 to 1. 2.15, more preferably about 1.1 to 2.0. The average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.
セルロースエステルとしては、有機酸エステル（例えば、炭素数２〜４程度の有機酸とのエステル）、特にセルロースアセテートが好適である。セルロースアセテートの酢化度は、４３〜６２％程度である場合が多いが、特に３０〜５０％程度であると生分解性にも優れるため好ましい。 As the cellulose ester, an organic acid ester (for example, an ester with an organic acid having about 2 to 4 carbon atoms), particularly cellulose acetate is suitable. The degree of acetylation of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability.
トウ構成繊維は、種々の添加剤、例えば、熱安定化剤、着色剤、油剤、歩留り向上剤、白色度改善剤等を含有していても良い。 The tow constituent fiber may contain various additives such as a heat stabilizer, a colorant, an oil agent, a yield improver, a whiteness improver, and the like.
トウ構成繊維の繊度は、例えば、１〜１６デニール、好ましくは１〜１０デニール、さらに好ましくは２〜８デニール程度とすることができる。トウ構成繊維は、非捲縮繊維であってもよいが、捲縮繊維であるのが好ましい。捲縮繊維の捲縮度は、例えば、１インチ当たり５〜７５個、好ましくは１０〜５０個、さらに好ましくは１５〜５０個程度とすることができる。また、均一に捲縮した捲縮繊維を用いる場合が多い。捲縮繊維を用いると、嵩高で軽量な吸収体を製造できるとともに、繊維間の絡み合いにより一体性の高いトウを容易に製造できる。トウ構成繊維の断面形状は、特に限定されず、例えば、円形、楕円形、異形（例えば、Ｙ字状、Ｘ字状、Ｉ字状、Ｒ字状など）や中空状などのいずれであってもよい。トウ構成繊維は、例えば、３，０００〜１，０００，０００本、好ましくは５，０００〜１，０００，０００本程度の単繊維を束ねることにより形成されたトウ（繊維束）の形で使用することができる。繊維束は、３，０００〜１，０００，０００本程度の連続繊維を集束して構成するのが好ましい。 The fineness of the tow constituent fibers can be, for example, about 1 to 16 denier, preferably about 1 to 10 denier, and more preferably about 2 to 8 denier. The tow constituent fiber may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. When crimped fibers are used, a bulky and light absorbent body can be produced, and a tow with high unity can be easily produced by entanglement between the fibers. The cross-sectional shape of the tow constituting fiber is not particularly limited, and may be any one of, for example, a circular shape, an oval shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. Also good. The tow constituent fibers are used, for example, in the form of tows (fiber bundles) formed by bundling about 3,000 to 1,000,000, preferably about 5,000 to 1,000,000 single fibers. can do. The fiber bundle is preferably formed by bundling about 3,000 to 1,000,000 continuous fibers.
トウは、繊維間の絡み合いが弱いため、主に形状を維持する目的で、繊維の接触部分を接着または融着する作用を有するバインダーを用いることができる。バインダーとしては、トリアセチン、トリエチレングリコールジアセテート、トリエチレングリコールジプロピオネート、ジブチルフタレート、ジメトキシエチルフタレート、クエン酸トリエチルエステルなどのエステル系可塑剤の他、各種の樹脂接着剤、特に熱可塑性樹脂を用いることができる。 Since the entanglement between fibers is weak, a binder having an action of adhering or fusing the contact portions of the fibers can be used mainly for the purpose of maintaining the shape. The binder includes triacetin, triethylene glycol diacetate, triethylene glycol dipropionate, dibutyl phthalate, dimethoxyethyl phthalate, citric acid triethyl ester, and other plastic resins, as well as various resin adhesives, especially thermoplastic resins. Can be used.
熱可塑性樹脂は、溶融・固化により接着力が発現する樹脂であり、水不溶性または水難溶性樹脂、および水溶性樹脂が含まれる。水不溶性または水難溶性樹脂と水溶性樹脂とは、必要に応じて併用することもできる。 Thermoplastic resins, the adhesive strength is a resin expressed, are water-insoluble or sparingly water-soluble resins, and water-soluble resin by the melt and solidification. A water-insoluble or poorly water-soluble resin and a water-soluble resin can be used together as necessary.
水不溶性または水難溶性樹脂としては、例えば、ポリエチレン、ポリプロピレン、エチレン−プロピレン共重合体、エチレン−酢酸ビニル共重合体などのオレフィン系の単独又は共重合体、ポリ酢酸ビニル、ポリメタクリル酸メチル、メタクリル酸メチル−アクリル酸エステル共重合体、（メタ）アクリル系モノマーとスチレン系モノマーとの共重合体などのアクリル樹脂、ポリ塩化ビニル、酢酸ビニル−塩化ビニル共重合体、ポリスチレン、スチレン系モノマーと（メタ）アクリル系モノマーとの共重合体などのスチレン系重合体、変性されていてもよいポリエステル、ナイロン１１、ナイロン１２、ナイロン６１０、ナイロン６１２などのポリアミド、ロジン誘導体（例えば、ロジンエステルなど）、炭化水素樹脂（例えば、テルペン樹脂、ジシクロペンタジエン樹脂、石油樹脂など）、水素添加炭化水素樹脂などを用いることができる。これらの熱可塑性樹脂は一種又は二種以上使用できる。 Examples of water-insoluble or hardly water-soluble resins include polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer and other olefinic homo- or copolymers, polyvinyl acetate, polymethyl methacrylate, methacryl Acid methyl-acrylic acid ester copolymer, acrylic resin such as copolymer of (meth) acrylic monomer and styrene monomer, polyvinyl chloride, vinyl acetate-vinyl chloride copolymer, polystyrene, styrene monomer ( Styrenic polymers such as copolymers with (meth) acrylic monomers, polyesters that may be modified, nylon 11, nylon 12, nylon 610, nylon 612 and other polyamides, rosin derivatives (for example, rosin esters), Hydrocarbon resin (eg terpene tree , Dicyclopentadiene resins, and petroleum resins), and hydrogenated hydrocarbon resins. One or two or more of these thermoplastic resins can be used.
水溶性樹脂としては、種々の水溶性高分子、例えば、ポリビニルアルコール、ポリビニルピロリドン、ポリビニルエーテル、ビニル単量体と、カルボキシル基、スルホン酸基又はそれらの塩を有する共重合性単量体との共重合体などのビニル系水溶性樹脂、アクリル系水溶性樹脂、ポリアルキレンオキサイド、水溶性ポリエステル、水溶性ポリアミドなどを用いることができる。これらの水溶性樹脂は、単独で使用できるとともに二種以上組合せて使用してもよい。 Examples of water-soluble resins include various water-soluble polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl ether, vinyl monomers, and copolymerizable monomers having a carboxyl group, a sulfonic acid group, or a salt thereof. Vinyl water-soluble resins such as copolymers, acrylic water-soluble resins, polyalkylene oxides, water-soluble polyesters, water-soluble polyamides, and the like can be used. These water-soluble resins can be used alone or in combination of two or more.
熱可塑性樹脂には、酸化防止剤、紫外線吸収剤などの安定化剤、充填剤、可塑剤、防腐剤、防黴剤などの種々の添加剤を添加してもよい。 Various additives such as stabilizers such as antioxidants and ultraviolet absorbers, fillers, plasticizers, preservatives, and antifungal agents may be added to the thermoplastic resin.
トウからなる本発明の繊維集合体１０は公知の方法により製造でき、その際、本発明では所望のサイズ、嵩となるように開繊される。トウの開繊幅は任意であり、例えば、幅１００〜２０００ｍｍ、好ましくは１５０〜１５００ｍｍ程度とすることができる。トウを開繊すると、後述する高吸収性ポリマーの移動がより容易になるため好ましい。 The fiber assembly 10 of the present invention made of tow can be produced by a known method, and in this case, in the present invention, the fiber assembly 10 is opened to have a desired size and bulk. The opening width of the tow is arbitrary and can be, for example, about 100 to 2000 mm, preferably about 150 to 1500 mm. Opening the tow is preferable because the movement of the superabsorbent polymer described later becomes easier.
トウの開繊度合いを調整することにより、繊維集合体１０の密度を調整することができる。本発明の繊維集合体１０としては、厚さを１０ｍｍとしたときの繊維密度が０．００７５ｇ／ｃｍ3以下、特に０．００６０〜０．００７０ｇ／ｃｍ3であるものが好適である。過度に繊維密度が高くなると、トウからなる繊維集合体１０を用いることによる利点が少なくなり、例えば軽量化や薄型化を図り難くなる。また、繊維集合体１０の目付けは、０．００７５ｇ／ｃｍ3以下、特に０．００６０〜０．００７０ｇ／ｃｍ3であるものが好適である。繊維目付けは、原反となるトウの選択、あるいはその製造条件により調整できる。 The density of the fiber assembly 10 can be adjusted by adjusting the degree of tow opening. The fiber aggregate 10 of the present invention, the fiber density at the time of a thickness of 10mm is 0.0075 g / cm 3 or less, is suitable as a particularly 0.0060~0.0070g / cm 3. When the fiber density is excessively high, the advantage of using the fiber assembly 10 made of tow is reduced, and for example, it is difficult to reduce the weight and thickness. Moreover, the fabric weight of the fiber assembly 10 is preferably 0.0075 g / cm 3 or less, particularly 0.0060 to 0.0070 g / cm 3 . The fiber basis weight can be adjusted by selecting a tow serving as a raw fabric or manufacturing conditions thereof.
トウの開繊方法としては、例えば、トウを複数の開繊ロールに掛渡し、トウの進行に伴なって次第にトウの幅を拡大して開繊する方法、トウの緊張（伸長）と弛緩（収縮）とを繰返して開繊する方法、圧縮エアーを用いて拡幅・開繊する方法などを用いることができる。 As a method for opening a tow, for example, a method in which a tow is passed over a plurality of opening rolls and the width of the tow is gradually expanded as the tow progresses, and tension (elongation) and relaxation of the tow ( (Shrinkage) can be repeated, and a method of widening and opening using compressed air can be used.
図２は開繊設備例を示す概略図である。この例では、原反となるトウ１が順次繰り出され、その搬送過程で、圧縮エアーを用いる拡幅手段２と下流側のロールほど周速の速い複数の開繊ニップロール３，４，５とを組み合わせた開繊部を通過され拡幅・開繊された後、バインダー添加ボックス６に通され、バインダーを付与（例えばトリアセチンのミストをボックス中に充満させる）され、所望の幅・密度のトウからなる繊維集合体１０として形成されるようになっている。繊維集合体１０は、第一工程のラインと直結し、製造した繊維集合体１０を吸収性複合体の製造ラインに直接に送り込むことができる。 FIG. 2 is a schematic view showing an example of a fiber opening facility. In this example, the tow 1 serving as a raw fabric is sequentially fed out, and in the process of conveying, the widening means 2 using compressed air and a plurality of spread nip rolls 3, 4, and 5 whose peripheral speed is faster as the roll on the downstream side is combined. After passing through the opened portion and widened / opened, the fiber is passed through the binder addition box 6 to which a binder is added (for example, the box is filled with a mist of triacetin), and the fibers are made of tow having a desired width and density. It is formed as an aggregate 10. The fiber assembly 10 can be directly connected to the first process line, and the manufactured fiber assembly 10 can be directly fed to the production line of the absorbent composite.
一方、第一工程では、供給される連続帯状の繊維集合体１０に単量体液が保持される。この単量体液としては、重合により高吸収性ポリマーとなるものであれば特に限定されないが、アクリル酸および／またはその塩（以下アクリル酸系単量体と総称する）を主成分とする単量体の水溶液が好適に用いられる。好ましい単量体は、アクリル酸の２０〜９０モル％がアルカリ金属塩またはアンモニウム塩に変換されているアクリル酸とアクリル酸塩との混合物である。アクリル酸系単量体以外の単量体も併用することができ、具体例としては、メタクリル酸またはその塩、（メタ）アクリルアミド、２−ヒドロキシエチル（メタ）アクリレートおよび２―アクリルアミド―２−メチルプロパンスルホン酸またはその塩等が挙げられる。かかる単量体の好ましい使用量は、アクリル酸系単量体との合計量を基準にして２０モル％以下である。 On the other hand, in a 1st process, a monomer liquid is hold | maintained at the continuous strip-shaped fiber assembly 10 supplied. The monomer liquid is not particularly limited as long as it becomes a superabsorbent polymer by polymerization, but is a single monomer mainly composed of acrylic acid and / or a salt thereof (hereinafter collectively referred to as an acrylic monomer). An aqueous solution of the body is preferably used. A preferred monomer is a mixture of acrylic acid and acrylate in which 20 to 90 mole percent of acrylic acid is converted to an alkali metal salt or ammonium salt. Monomers other than acrylic acid monomers can be used in combination. Specific examples include methacrylic acid or a salt thereof, (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, and 2-acrylamido-2-methyl. Examples thereof include propanesulfonic acid or a salt thereof. The preferable usage amount of such a monomer is 20 mol% or less based on the total amount with the acrylic acid monomer.
単量体液における単量体の好ましい濃度は、２０〜８０質量％で、更に好ましくは４０〜６０質量％である。単量体濃度が高ければ、繊維集合体上に吸水性樹脂を多量に固着させ易く、また単量体を重合させた後の乾燥処理に際し、必要とする熱エネルギーを削減できる。従って、可能な限り高濃度の単量体液を使用することが好ましい。通常は、単量体の飽和溶解度付近の濃度が選択される。 The preferable concentration of the monomer in the monomer liquid is 20 to 80% by mass, and more preferably 40 to 60% by mass. If the monomer concentration is high, a large amount of the water-absorbing resin can be easily fixed on the fiber assembly, and the necessary heat energy can be reduced in the drying treatment after polymerizing the monomer. Therefore, it is preferable to use a monomer solution having a concentration as high as possible. Usually, a concentration near the saturation solubility of the monomer is selected.
単量体液には、必要に応じて、単量体以外に架橋剤および重合開始剤等を添加することができる。架橋剤としては、エチレングリコールジ（メタ）アクリレート、ジエチレングリコールジ（メタ）アクリレート、ポリエチレングリコールジ（メタ）アクリレート、プロピレングリコールジ（メタ）アクリレート、ポリプロピレングリコールジ（メタ）アクリレート、グリセリントリ（メタ）アクリレート、Ｎ，Ｎ’−メチレンビスアクリルアミド、ジアリルフタレート、トリアリルシアヌレート、トリアリルイソシアヌレートおよびトリアリルホスフェート等が例示できる。架橋剤の添加割合は、単量体合計質量に対して１００〜１０００ｐｐｍが好ましく、３００〜７５０ｐｐｍが特に好ましい。 A crosslinking agent, a polymerization initiator, etc. can be added to a monomer liquid other than a monomer as needed. Cross-linking agents include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, and glycerin tri (meth) acrylate. N, N′-methylenebisacrylamide, diallyl phthalate, triallyl cyanurate, triallyl isocyanurate, triallyl phosphate and the like. The addition ratio of the crosslinking agent is preferably from 100 to 1000 ppm, particularly preferably from 300 to 750 ppm, based on the total mass of the monomers.
重合開始剤としては、熱によりラジカルを発生する熱重合開始剤や、紫外線、電子線等の活性エネルギー線の照射によりラジカルを発生する光重合開始剤等、公知のあらゆる重合開始剤を用いることができる。熱重合開始剤としては、過酸化水素、過硫酸アンモニウム、過硫酸カリウム、ｔ−ブチルハイドロパーオキサイド及びクメンハイドロパーオキサイド等の水溶性ラジカル重合開始剤等を用いることができる。これらの化合物は、例えば、亜硫酸水素ナトリウム、チオ硫酸ナトリウム、Ｌ−アスコルビン酸またはアミン等の還元性化合物と併用して、レドックス系重合開始剤として使用しても良い。また、光重合開始剤としては、２，２’−アゾビス（２−アミノジプロパン）塩等のアゾ化合物、１−ベンゾイル−１−ヒドロキシシクロヘキサン及びベンゾフェノン等のケトン、ベンゾイン及びそのアルキルエーテル、ベンジルケタール類、並びにアントラキノン誘導体等の紫外線照射によりラジカルを発生させるものを用いることができる。 As the polymerization initiator, it is possible to use any known polymerization initiator such as a thermal polymerization initiator that generates radicals by heat and a photopolymerization initiator that generates radicals by irradiation of active energy rays such as ultraviolet rays and electron beams. it can. As the thermal polymerization initiator, water-soluble radical polymerization initiators such as hydrogen peroxide, ammonium persulfate, potassium persulfate, t-butyl hydroperoxide and cumene hydroperoxide can be used. These compounds may be used as a redox polymerization initiator in combination with a reducing compound such as sodium bisulfite, sodium thiosulfate, L-ascorbic acid or amine. Examples of the photopolymerization initiator include azo compounds such as 2,2′-azobis (2-aminodipropane) salt, ketones such as 1-benzoyl-1-hydroxycyclohexane and benzophenone, benzoin and its alkyl ether, benzyl ketal. And those that generate radicals by ultraviolet irradiation, such as anthraquinone derivatives, can be used.
光重合開始剤の添加量は、単量体に対して１００〜２０００ｐｐｍが好ましい。光重合開始剤の濃度が１００ｐｐｍ未満の場合は、充分に重合が起らず、また２０００ｐｐｍを超える場合は得られる重合体の重合度が低下する。さらに光重合開始剤に加えて、熱分解型ラジカル重合開始剤を併用するのは好ましい形態である。この開始剤の併用により、ＵＶ重合と並行的に熱重合も起り、その結果重合転換率が上がり未反応単量体の残存量を低減できる。熱分解型ラジカル重合開始剤の添加量は、単量体に対して１００〜５０００ｐｐｍが好ましく、特に５００〜２０００ｐｐｍが好ましい。熱分解型ラジカル重合開始剤の重合温度は５０〜８０℃が好ましく、従って熱分解型ラジカル重合開始剤としては、水中にて８０℃以下で分解してラジカルを発生する化合物が好ましい。具体的には過硫酸アンモニウムや過硫酸ナトリウム等の過硫酸塩等を用いることができる。 The addition amount of the photopolymerization initiator is preferably 100 to 2000 ppm with respect to the monomer. When the concentration of the photopolymerization initiator is less than 100 ppm, sufficient polymerization does not occur, and when it exceeds 2000 ppm, the degree of polymerization of the resulting polymer is lowered. In addition to the photopolymerization initiator, it is preferable to use a thermal decomposition type radical polymerization initiator in combination. By using this initiator in combination, thermal polymerization also occurs in parallel with UV polymerization. As a result, the polymerization conversion rate increases and the remaining amount of unreacted monomer can be reduced. The amount of the thermal decomposition type radical polymerization initiator added is preferably from 100 to 5000 ppm, particularly preferably from 500 to 2000 ppm, based on the monomer. The polymerization temperature of the thermal decomposition type radical polymerization initiator is preferably from 50 to 80 ° C. Therefore, the thermal decomposition type radical polymerization initiator is preferably a compound that decomposes in water at 80 ° C. or less to generate radicals. Specifically, persulfates such as ammonium persulfate and sodium persulfate can be used.
単量体液には、更に添加剤として、連鎖移動剤や界面活性剤等を必要により添加しても良い。 If necessary, a chain transfer agent, a surfactant, or the like may be added to the monomer solution as an additive.
単量体液は、図１に示すようにスプレーノズル１１により繊維集合体１０に散布しても良く、また図３に示すように容器１２に貯留された単量体液１２Ｍ中に繊維集合体１０を通過させ、繊維集合体中１０に単量体液１２Ｍを含浸させても良い。 The monomer liquid may be sprayed on the fiber assembly 10 by the spray nozzle 11 as shown in FIG. 1, and the fiber assembly 10 is put in the monomer liquid 12M stored in the container 12 as shown in FIG. It is possible to pass through and impregnate the monomer assembly 12M into the fiber assembly 10.
また、単量体液は、繊維集合体１０に噴霧することにより、繊維集合体１０に独立した微細粒子状に保持させることもできる。単量体液を霧状にする方法としては、公知の微粒化技術を利用できる。例えば、滴化法、スプレーノズルを用いた液滴化法、回転盤型アトマイザーを用いた液滴化法、超音波法等が挙げられる。噴霧液滴の平均径は、５０〜５００μｍが好ましい。平均径が５０μｍに満たない場合は、繊維集合体１０に噴霧した液滴が繊維集合体１０に付着することなく裏側まで突抜けやすくなるため、繊維集合体１０へ付着し難くなる場合がある。液滴の平均径が５００μｍを超える場合は、液滴の付着が不均一となる場合がある。５０〜５００μｍの大きさの単量体液は重合、乾燥工程を経ることにより、略３０〜３００μｍの粒子状の高吸収性ポリマーとなって、繊維集合体１０に固着される。 Further, the monomer liquid can be held in the form of fine particles independent of the fiber assembly 10 by spraying the fiber assembly 10. A known atomization technique can be used as a method for atomizing the monomer liquid. Examples thereof include a droplet formation method, a droplet formation method using a spray nozzle, a droplet formation method using a rotating disk atomizer, and an ultrasonic method. The average diameter of the spray droplets is preferably 50 to 500 μm. When the average diameter is less than 50 μm, the droplet sprayed on the fiber assembly 10 does not adhere to the fiber assembly 10 and easily penetrates to the back side, so that it may be difficult to adhere to the fiber assembly 10. When the average diameter of the droplets exceeds 500 μm, the adhesion of the droplets may be uneven. The monomer liquid having a size of 50 to 500 μm is fixed to the fiber assembly 10 as a superabsorbent polymer having a particle size of about 30 to 300 μm through a polymerization and drying process.
単量体液の保持量は、適宜定めることができるが、重合後における繊維集合体１０に対する高吸収性ポリマーの固着量が５〜５００ｇ／ｍ2となる量が好ましく、特に２０〜３００ｇ／ｍ2が好ましい。 The amount of the monomer liquid retained can be determined as appropriate, but is preferably such that the amount of the superabsorbent polymer fixed to the fiber assembly 10 after polymerization is 5 to 500 g / m 2 , particularly 20 to 300 g / m 2. Is preferred.
このようにして単量体液が保持された繊維集合体１０は、そのまま第二工程に供給しても良いが、より好ましくは、単量体の重合に先立ち繊維集合体１０に外力を加え、繊維間に跨る単量体液膜を解消させる。具体的方法としては、繊維集合体に振動を与える、繊維集合体に空気流を通過させる等でも良いが、繊維集合体の製造時にトウの捲縮を行わない或いはある程度まで捲縮を行っておき、この段階、すなわち単量体を含む液を保持させた後であって、単量体を重合させる前に捲縮加工を施すのも好ましい形態である。図１に示す形態では、このための捲縮加工装置１３が設けられている。 The fiber assembly 10 in which the monomer liquid is held in this way may be supplied to the second step as it is, but more preferably, an external force is applied to the fiber assembly 10 prior to the polymerization of the monomer, The monomer liquid film straddling it is eliminated. As a specific method, vibration may be applied to the fiber assembly, an air flow may be passed through the fiber assembly, etc., but the tow is not crimped or crimped to some extent when the fiber assembly is manufactured. In this stage, that is, after holding the liquid containing the monomer, it is also preferable to perform crimping before polymerizing the monomer. In the form shown in FIG. 1, a crimping apparatus 13 for this purpose is provided.
次いで、単量体液が保持された繊維集合体１０は、第二工程に送られ重合がなされる。単量体の重合は、一般的なラジカル重合法によって行うことができ、単量体液の組成に応じて適宜の手段により重合を開始させれば良い。重合方法としては、熱によりラジカルを発生する化合物を重合開始剤として用いる熱重合法、または紫外線、電子線等の活性エネルギー線の照射により重合開始させる方法等が採用できる。本発明では、好ましくは熱重合法または光重合開始剤の存在下に紫外線照射する方法（以下、ＵＶ照射重合法という）であり、特に好ましくはＵＶ照射重合法である。 Next, the fiber assembly 10 in which the monomer liquid is retained is sent to the second step and polymerized. The polymerization of the monomer can be performed by a general radical polymerization method, and the polymerization may be started by an appropriate means depending on the composition of the monomer liquid. As a polymerization method, a thermal polymerization method using a compound that generates radicals by heat as a polymerization initiator, or a method of starting polymerization by irradiation with an active energy ray such as an ultraviolet ray or an electron beam can be employed. In the present invention, a thermal polymerization method or a method of irradiating ultraviolet rays in the presence of a photopolymerization initiator (hereinafter referred to as a UV irradiation polymerization method) is preferable, and a UV irradiation polymerization method is particularly preferable.
重合に際しては、単量体液を取り囲む雰囲気を窒素ガス等の不活性ガスで置換し、酸素を極力排除することが好ましい。 In the polymerization, it is preferable to replace the atmosphere surrounding the monomer liquid with an inert gas such as nitrogen gas so as to eliminate oxygen as much as possible.
ＵＶ照射を行う際の紫外線ランプとしては、高圧水銀ランプやメタルハライドランプ等の２５０〜４５０ｎｍの波長を照射可能なもので、３０〜２４０Ｗ／ｃｍのランプ入力の水銀ランプが好ましい。紫外線照射量は１００〜１００００ｍｊ／ｃｍ2、より好ましくは２０００〜６０００ｍｊ／ｃｍ2である。必要な線量に応じて水銀ランプを多数並べて使用することができる。図１に示す形態ではこの紫外線ランプ１４が示されている。 As an ultraviolet lamp for performing UV irradiation, a mercury lamp having a lamp input of 30 to 240 W / cm, such as a high pressure mercury lamp or a metal halide lamp, which can irradiate a wavelength of 250 to 450 nm is preferable. The amount of ultraviolet irradiation is 100 to 10000 mj / cm 2 , more preferably 2000 to 6000 mj / cm 2 . Many mercury lamps can be used side by side according to the required dose. In the form shown in FIG. 1, this ultraviolet lamp 14 is shown.
ＵＶ照射により単量体の大半（約９０％以上）が５〜６０秒程度で重合を完結する。この際、重合温度は繊維集合体に塗布された単量体水溶液の微粒子の温度として８０〜９０℃程度と推測される。このようにして、水分を１５〜３０質量％程度および未反応単量体を０．１〜１０質量％含む含水重合体粒子が繊維集合体１０上に形成される。さらに適当な時間加熱または保温を継続し、未反応単量体を低減させるとともに含水重合体粒子を乾燥させることにより、吸収性複合体２０が得られる。本発明の吸収性複合体２０の製造方法では、繊維集合体１０に対する高吸収性ポリマーの固着量は１００ｇ／ｍ2以上であるのが好ましく、特に１５０〜１０００ｇ／ｍ2であるのが好ましい。 By UV irradiation, most of the monomer (about 90% or more) completes polymerization in about 5 to 60 seconds. At this time, the polymerization temperature is estimated to be about 80 to 90 ° C. as the temperature of fine particles of the aqueous monomer solution applied to the fiber assembly. In this way, water-containing polymer particles containing about 15 to 30% by mass of water and 0.1 to 10% by mass of unreacted monomers are formed on the fiber assembly 10. Furthermore, the absorbent composite 20 is obtained by continuing heating or heat retention for an appropriate time to reduce the unreacted monomer and to dry the water-containing polymer particles. In the manufacturing method for absorbent composite 20 of the present invention, sticking amount of the superabsorbent polymer to the fiber assembly 10 is preferably at 100 g / m 2 or more, particularly preferably 150~1000g / m 2.
得られた吸収性複合体２０は、吸水性能（吸水速度、吸水量、液拡散性、液逆戻り防止性等）をより一層向上させる目的で、必要に応じて更に熱圧縮することができる。熱圧縮は熱プレス、熱ロールまたはエンボスロール等を用いて行うことが好ましい。熱圧縮温度は、５０〜１５０℃が好ましく、７０〜１２０℃がより好ましい。熱圧縮温度が５０℃未満の場合は十分な圧縮効果が得られず、１５０℃よりも高い場合は繊維集合体が熱溶融して得られる吸収性複合体の柔軟性が損われる場合があるので、好ましくない。熱圧縮圧力は、０．０１〜１００ＭＰａが好ましく、０．１〜１０ＭＰａがより好ましい。熱圧縮時間は、熱圧縮温度及び熱圧縮圧力により異なるが、１〜１００秒が好ましい。 The obtained absorbent composite 20 can be further thermally compressed as necessary for the purpose of further improving the water absorption performance (water absorption speed, water absorption amount, liquid diffusibility, liquid reversion preventive property, etc.). The thermal compression is preferably performed using a hot press, a hot roll, an embossing roll, or the like. The heat compression temperature is preferably 50 to 150 ° C, more preferably 70 to 120 ° C. When the heat compression temperature is less than 50 ° C., a sufficient compression effect cannot be obtained, and when it is higher than 150 ° C., the flexibility of the absorbent composite obtained by heat melting the fiber assembly may be impaired. It is not preferable. The hot compression pressure is preferably from 0.01 to 100 MPa, more preferably from 0.1 to 10 MPa. Although heat compression time changes with heat compression temperature and heat compression pressure, 1 to 100 second is preferable.
工業的規模で熱圧縮する場合は、特に熱ロールを用いることが好ましい。具体的には、図１に示すように一対のロール１５，１６を１〜１００ｋｇ／ｃｍの線圧になるように加圧しながら、吸収性複合体２０を連続的にロール１５，１６間に導き、ロール１５，１６間で熱圧縮する。熱圧縮に用いる一対のロール１５，１６の間隙は熱圧縮される吸収性複合体２０の厚さにもよるが、通常１０〜５００μｍが好ましい。１０μｍ未満の場合は、吸収性複合体２０が切断される場合があり、また５００μｍを超える場合は圧縮効果が不十分になる。 When heat-compressing on an industrial scale, it is particularly preferable to use a heat roll. Specifically, as shown in FIG. 1, the absorbent composite 20 is continuously guided between the rolls 15 and 16 while pressurizing the pair of rolls 15 and 16 to a linear pressure of 1 to 100 kg / cm. Then, heat compression is performed between the rolls 15 and 16. The gap between the pair of rolls 15 and 16 used for thermal compression is preferably 10 to 500 μm, although it depends on the thickness of the absorbent composite 20 to be thermally compressed. When the thickness is less than 10 μm, the absorbent composite 20 may be cut, and when the thickness exceeds 500 μm, the compression effect is insufficient.
一対のロール１５，１６は、少なくとも一方のロールに凹凸模様が形成されていることが好ましい。凹凸模様の深さは、０．００１ｍｍ以上、好ましくは０．０１〜１ｍｍが好ましい。凹凸模様は、１０ｍｍ以下の間隔で凹凸が繰返されているものや、直径１０ｍｍの円に収る模様が１０ｍｍ以下の間隔で連続的に形成されていることが好ましい。繰返し間隔が１０ｍｍを超える模様や、１０ｍｍの円に収らない模様の場合は繊維集合体を圧縮することにより生じる利点が不十分となるおそれがある。 As for a pair of rolls 15 and 16, it is preferable that the uneven | corrugated pattern is formed in at least one roll. The depth of the concavo-convex pattern is 0.001 mm or more, preferably 0.01 to 1 mm. The concavo-convex pattern is preferably such that the concavo-convex pattern is repeated at intervals of 10 mm or less, or a pattern that fits in a circle with a diameter of 10 mm is continuously formed at intervals of 10 mm or less. In the case of a pattern in which the repetition interval exceeds 10 mm or a pattern that does not fit in a 10 mm circle, there is a possibility that the advantage produced by compressing the fiber assembly may be insufficient.
かくして、製造された吸水性複合体２０は、図４に示すように、高吸収性ポリマー２２の膨潤に十分な空隙が確保されるとともに、繊維２１，２１相互の絡み合いが少なく、高吸収性ポリマー２２の膨張に応じて空隙が広がる（膨張する）ことができる。よって、従来のような吸収阻害が発生し難くなり、高吸収性ポリマー２２が本来有する吸収能力を十分に発揮させることができるようになる。 Thus, as shown in FIG. 4, the produced water-absorbing composite 20 has a sufficient space for swelling of the superabsorbent polymer 22 and less entanglement between the fibers 21 and 21, and the superabsorbent polymer 20. In accordance with the expansion of 22, the gap can expand (expand). Therefore, the conventional absorption inhibition is less likely to occur, and the absorption capability inherent to the superabsorbent polymer 22 can be sufficiently exhibited.
他方、上記第一工程〜第二工程までの部分は、一回または複数回繰り返し行い、繊維集合体１０に対する高吸収性ポリマーの付着量を増加させることができる。この場合１回当りの単量体液の塗布量は１０〜１０００ｇ／ｍ2が好ましく、さらに好ましくは５０〜５００ｇ／ｍ2である。また、先の工程における単量体液の重合が進み、重合率で５０％以上となった段階で、次の単量体液を塗布するのが好ましい。先に塗布された単量体の重合率が５０％未満の段階で次の単量体水溶液を塗布すると、単量体水溶液の液滴が半重合物と合一し、大きな粒子を形成する結果、得られる吸収性複合体２０が硬くなり易く、また吸水性も不十分となり易い。このような単量体液の保持および重合操作の繰返し回数は、得られる吸収性複合体２０の使用目的等を勘案して適宜決定することができる。 On the other hand, the part from the first step to the second step can be repeated once or a plurality of times to increase the amount of the superabsorbent polymer attached to the fiber assembly 10. In this case, the coating amount of the monomer liquid per one time is preferably 10 to 1000 g / m 2 , more preferably 50 to 500 g / m 2 . Further, it is preferable to apply the next monomer liquid when the polymerization of the monomer liquid in the previous step proceeds and the polymerization rate reaches 50% or more. When the next monomer aqueous solution is applied when the polymerization rate of the previously applied monomer is less than 50%, droplets of the monomer aqueous solution coalesce with the semipolymer and form large particles. The resulting absorbent composite 20 tends to be hard and the water absorption tends to be insufficient. The number of times the monomer liquid is retained and the polymerization operation is repeated can be appropriately determined in consideration of the intended use of the resulting absorbent composite 20.
またこのような単量体液の保持および重合操作の繰返しを行う場合、１サイクル毎に、カルボキシル基と反応性のエポキシ基等を複数有する表面処理液を複合体２０に付着した高吸収性ポリマーに付与するのが望ましい。この操作により、先の工程で付与された高吸収性ポリマーの表面層の架橋度をさらに上げることができる。この表面処理剤としては、エチレングリコールジグリシジルエーテル、ポリエチレングリコールジグリシジルエーテル等のグリシジルエーテル、ジエチレングリコール、トリエチレングリコール、プロピレングリコール、グリセリン、ペンタエリスリトール等のポリオール、エチレンジアミン等のポリアミン等を用いることができる。表面処理剤の添加量は、吸水性樹脂粒子に対して１００〜１０００ｐｐｍが好ましい。 In addition, when the retention of the monomer liquid and the polymerization operation are repeated, the surface treatment liquid having a plurality of carboxyl groups and reactive epoxy groups and the like is added to the composite 20 for each cycle. It is desirable to give. By this operation, the degree of crosslinking of the superabsorbent polymer surface layer applied in the previous step can be further increased. Examples of the surface treatment agent include glycidyl ethers such as ethylene glycol diglycidyl ether and polyethylene glycol diglycidyl ether, polyols such as diethylene glycol, triethylene glycol, propylene glycol, glycerin and pentaerythritol, and polyamines such as ethylenediamine. . The addition amount of the surface treatment agent is preferably 100 to 1000 ppm with respect to the water absorbent resin particles.
（吸収性物品への応用形態）
図５及び図６は、本発明に係る吸収性複合体を含む吸収体を紙おむつに適用した例を示しており、使用者の肌側に位置する透液性の透液性表面シート３１と、製品の外側に位置し、実質的に液を透過させない不透液性シート、例えばポリエチレン等からなる完全に液を透過させない不透液性裏面シート３２との間に、前述の吸収性複合体からなる吸収体３７が介在されたものである。
(Application form to absorbent articles)
5 and 6 show an example in which an absorbent body including an absorbent composite according to the present invention is applied to a paper diaper, and a liquid-permeable liquid-permeable surface sheet 31 located on the user's skin side, Between the absorbent composite and the liquid-impervious sheet that is located outside the product and substantially impermeable to liquid, such as polyethylene and the liquid-impervious back sheet 32 that does not allow liquid to completely penetrate. An absorbent body 37 is interposed.
この吸収体３７は、前述の製造方法により製造した吸収性複合体２０を適当な長さ、あるいは形状に切断することにより得ることができる。またこの吸収体３７は、必要に応じて、クレープ紙等の液透過性シートにより包装することができる。 The absorbent body 37 can be obtained by cutting the absorbent composite 20 produced by the above-described production method into an appropriate length or shape. Moreover, this absorber 37 can be packaged with a liquid-permeable sheet such as crepe paper as necessary.
裏面シート３２は吸収体３７より幅広の長方形をなし、その外方に肌触り向上のための不織布からなる外装シート３８が設けられている。一方、透液性表面シート３１は吸収体３７より幅広の長方形をなし、吸収体３７の側縁より若干外方に延在し、裏面シート３２とホットメルト接着剤などにより固着されている（この固着部分を含めて本形態に関係する固着部分を符号＊で示す）。 The back sheet 32 has a rectangular shape wider than the absorbent body 37, and an exterior sheet 38 made of a non-woven fabric for improving the touch is provided on the outer side. On the other hand, the liquid-permeable surface sheet 31 is formed in a rectangular shape wider than the absorbent body 37, extends slightly outward from the side edge of the absorbent body 37, and is fixed to the back sheet 32 with a hot melt adhesive (this The fixed part related to the present embodiment including the fixed part is indicated by a symbol *).
おむつの両側部には、使用面側に突出する脚周り用起立カフスＢが形成されている。この起立カフスＢは、実質的に幅方向に連続した不織布からなるサイドシート３４と、弾性伸縮部材、例えば糸ゴムからなる１本の又は図示のように複数本の脚周り用弾性伸縮部材３５とにより構成されたものである。サイドシート３４は、透液性でなく実質的に不透液性（半透液性でもよい）であるのが望ましく、例えば不織布に対してシリコン処理などにより液体をはじく性質となるようにしてもよい。 On both sides of the diaper, leg-standing standing cuffs B projecting toward the use surface are formed. The standing cuff B includes a side sheet 34 made of a non-woven fabric substantially continuous in the width direction, and an elastic elastic member, for example, one elastic elastic member 35 made of rubber thread or a plurality of leg elastic elastic members 35 as shown. It is comprised by. The side sheet 34 is preferably not liquid-permeable but substantially liquid-impervious (may be semi-liquid-permeable). For example, the side sheet 34 may have a property of repelling liquid by silicon treatment or the like. Good.
おむつの、装着時には、おむつが舟形に体に装着されること、そして各弾性伸縮部材３５の収縮力が作用することによって、脚周りでは、各弾性伸縮部材３５の収縮力により起立カフスＢが起立する。起立カフスＢの起立部で囲まれる空間は、尿等の***物の閉じ込め空間を形成する。この空間内に尿等が***されると、その***物は表面シート３１を通って吸収体３７内に吸収され、この際、起立カフスＢの起立部がバリヤーとなり、両脇からの体液の漏出が防止される。 When the diaper is mounted, the standing cuff B is erected around the leg by the contraction force of each elastic expansion / contraction member 35 due to the diaper being mounted on the body in the shape of a boat and the contraction force of each elastic expansion / contraction member 35 acting. To do. The space surrounded by the standing part of the standing cuff B forms a confinement space for excrement such as urine. When urine or the like is excreted in this space, the excreted matter is absorbed into the absorbent body 37 through the top sheet 31. At this time, the standing part of the standing cuff B serves as a barrier, and body fluid leaks from both sides. Is prevented.
図示形態の紙おむつは、腹側部分および背側部分を有し、腹側部分および背側部分のいずれか一方（図示例は背側）の部分の両側端部に止着片３７をそれぞれ有し、一方の部分の止着片３７を他方の部分（図示例は腹側のターゲットテープ３９）に止着することにより、胴回り開口部および一対の脚周り開口部が形成される、所謂テープ止着式紙おむつであるが、予め腹側および背側の両側端部が接合されたパンツ型紙おむつ、その他の体液吸収性物品にも適用できることはいうまでもない。 The paper diaper of the illustrated form has a ventral portion and a dorsal portion, and has fastening pieces 37 at both ends of either the ventral portion or the dorsal portion (the dorsal side in the illustrated example). The fastening piece 37 of one part is fastened to the other part (the illustrated example is the abdominal target tape 39) to form a waist opening and a pair of leg openings, so-called tape fastening. It is a type paper diaper, but it goes without saying that it can also be applied to a pants-type paper diaper in which both end portions of the abdomen and the back side are joined in advance, and other body fluid absorbent articles.
他方、図７は、本発明に係る吸収性複合体の、紙おむつＤＰや生理用ナプキンＮＰに対する適用例を示している。吸収性複合体６０は、そのトウの繊維（多数の線により示される）の連続方向が厚さ方向と直交する横方向に沿って設けられるのが望ましい。具体的には、図７（ａ）（ｂ）に示すように、そのトウの繊維連続方向が物品の長手方向（前後方向）に沿うように設けられるのが望ましいが、図７（ｃ）（ｄ）に示すようにトウの繊維連続方向が物品の幅方向に沿うように設けられることもできる。 On the other hand, FIG. 7 shows an application example of the absorbent composite according to the present invention to the disposable diaper DP and the sanitary napkin NP. The absorbent composite 60 is desirably provided along the lateral direction in which the continuous direction of the tow fibers (indicated by a number of lines) is orthogonal to the thickness direction. Specifically, as shown in FIGS. 7A and 7B, it is desirable that the fiber continuous direction of the tow be provided along the longitudinal direction (front-rear direction) of the article, but FIG. As shown in d), the fiber continuous direction of the tow may be provided along the width direction of the article.
（実施例１）
アクリル酸ナトリウム７０ｍｏｌ％、アクリル酸３０ｍｏｌ％からなる単量体水溶液（単量体合計含有量４２質量％）に、架橋剤としてテトラエチレングリコールジアクリレート（東亞合成株式会社製 アロニックスＭ−２４０）０．０５質量％（単量体質量基準）を添加し、この単量体水溶液を２０℃に冷却した。次いで、この単量体水溶液に窒素ガスを吹込み、溶存酸素濃度を１ｐｐｍ以下に低減させた。
Example 1
Tetraethylene glycol diacrylate (Aronix M-240, manufactured by Toagosei Co., Ltd.) as a crosslinking agent was added to a monomer aqueous solution (monomer total content 42 mass%) composed of 70 mol% sodium acrylate and 30 mol% acrylic acid. 05% by mass (based on monomer mass) was added, and the aqueous monomer solution was cooled to 20 ° C. Subsequently, nitrogen gas was blown into the monomer aqueous solution to reduce the dissolved oxygen concentration to 1 ppm or less.
この単量体水溶液に、光重合開始剤として１−ヒドロキシシクロヘキシル−フェニル−ケトン０．０２質量％（単量体質量基準）、熱重合開始剤として過硫酸ナトリウム０．１５質量％（単量体質量基準）を添加した。 In this monomer aqueous solution, 0.02% by mass of 1-hydroxycyclohexyl-phenyl-ketone as a photopolymerization initiator (based on monomer mass) and 0.15% by mass of sodium persulfate as a thermal polymerization initiator (monomer quality) Amount basis) was added.
一方、トウからなる繊維集合体（繊維密度０．００６５ｇ／ｃｍ3、非捲縮）に、調製した単量体水溶液をスプレーノズルを用いて３００ｇ／ｍ2（該水溶液の量で）の割合で散布した。この単量体水溶液をスプレーした繊維集合体に捲縮加工を施して、捲縮度を５０個／インチとした後、窒素雰囲気下で高圧水銀ランプを用いて紫外線を照射した。紫外線光量は４０００ｍｊ／ｃｍ2であった。得られた吸収性複合体は、吸水性樹脂が２００ｇ／ｍ2固着した柔軟性のあるものであった。 On the other hand, the prepared monomer aqueous solution was added to a fiber aggregate made of tow (fiber density 0.0065 g / cm 3 , non-crimped) at a rate of 300 g / m 2 (in the amount of the aqueous solution) using a spray nozzle. Scattered. The fiber assembly sprayed with this aqueous monomer solution was crimped to a crimp rate of 50 / inch, and then irradiated with ultraviolet rays using a high-pressure mercury lamp in a nitrogen atmosphere. The amount of ultraviolet light was 4000 mj / cm 2 . The obtained absorbent composite was flexible with a water-absorbing resin fixed to 200 g / m 2 .
（実施例２）
予め捲縮度が５０個／インチとなるように捲縮加工を施した繊維集合体を用い、単量体水溶液付与後の捲縮加工を行わなかったこと以外は、実施例１と同様にして吸収性複合体を製造した。
(Example 2)
The same procedure as in Example 1 was conducted, except that a fiber assembly that had been crimped so as to have a crimping degree of 50 pieces / inch in advance and that crimping was not performed after application of the monomer aqueous solution was performed. Absorbent composites were produced.
（比較例１）
トウからなる繊維集合体に変えて、ＰＥ／ＰＰからなるエアスルー不織布（目付：４０ｇ／ｍ2）を用いた以外は、実施例２と同様にして吸収性複合体を得た。
(Comparative Example 1)
An absorbent composite was obtained in the same manner as in Example 2 except that an air-through nonwoven fabric (weight per unit area: 40 g / m 2 ) made of PE / PP was used instead of the fiber assembly made of tow.
実施例１、２及び比較例１の吸収性複合体を以下に記載の試験法により評価した。その結果を表１に示した。なお、人工尿（１０ｋｇ当り）は以下の組成のものである。
尿素／ＮａＣｌ／ＭｇＳＯ 4 ・７Ｈ 2 Ｏ／ＣａＣｌ 2 ・２Ｈ 2 Ｏ／純水＝２００ｇ／８０ｇ／８．０ｇ／３．０ｇ／９７０９ｇ
The absorbent composites of Examples 1 and 2 and Comparative Example 1 were evaluated by the test methods described below. The results are shown in Table 1. Artificial urine (per 10 kg) has the following composition.
Urea / NaCl / MgSO 4 .7H 2 O / CaCl 2 .2H 2 O / pure water = 200 g / 80 g / 8.0 g / 3.0 g / 9709 g
（人工尿吸収量）
３００ｍｌのビーカーに６ｃｍ×７ｃｍに切出した吸収性複合体、及び人工尿２００ｍｌを入れ、３０分間室温で放置した。その後、人工尿を吸収して膨潤した吸収性複合体を人工尿中から取出し、２００メッシュの濾布で付着した人工尿をぬぐい去り、その質量を測定した。人工尿吸水量Ａ（ｋｇ／ｍ2）を下記式（１）により算出した。
Ａ＝（Ｗ１−Ｗ２）／０．４２ ・・・（１）
但し、Ｗ１は吸水後の、Ｗ２は吸水前の吸収性複合体の質量を示す。
(Artificial urine absorption)
An absorbent complex cut into 6 cm × 7 cm and 200 ml of artificial urine were placed in a 300 ml beaker and left at room temperature for 30 minutes. Then, the absorbent complex which absorbed artificial urine and swollen was taken out from the artificial urine, and the artificial urine adhered with a 200-mesh filter cloth was wiped off, and its mass was measured. The artificial urine water absorption A (kg / m 2 ) was calculated by the following formula (1).
A = (W1-W2) /0.42 (1)
However, W1 shows the mass of the absorptive complex after water absorption, W2 shows the mass of the absorptive complex before water absorption.
結果を表１に示した。この結果からも本発明の吸収性複合体が従来のものに比べて吸収性能に優れることが判る。 The results are shown in Table 1. From this result, it can be seen that the absorbent composite of the present invention is superior in absorption performance as compared with the conventional one.
本発明は、紙おむつや生理用ナプキン等の吸収性物品における吸収体として適用できるものである。 The present invention can be applied as an absorbent body in absorbent articles such as paper diapers and sanitary napkins.
１…、２…、３…、４…、５…、６…、７…、８…、９…、１０…トウからなる繊維集合体、１１…スプレーノズル、１３…捲縮加工装置、１４…紫外線ランプ、１５，１６…熱ロール、２０…吸収性複合体。 1 ... 2, ... 3 ... 4 ... 5 ..., 6 ..., 7 ..., 8 ..., 9 ... 10 ... fiber assembly made of tow, 11 ... spray nozzle, 13 ... crimping device, 14 ... UV lamp, 15, 16 ... hot roll, 20 ... absorbent composite.
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| JP2004194855A JP4414293B2 (en) | 2004-06-30 | 2004-06-30 | Method for producing absorbent composite |
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| JP2004194855A JP4414293B2 (en) | 2004-06-30 | 2004-06-30 | Method for producing absorbent composite |
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| JP2006016719A JP2006016719A (en) | 2006-01-19 |
| JP2006016719A5 true JP2006016719A5 (en) | 2007-05-17 |
| JP4414293B2 JP4414293B2 (en) | 2010-02-10 |
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| JP7399707B2 (en) | 2019-12-23 | 2023-12-18 | 株式会社リブドゥコーポレーション | Absorbent sheet manufacturing device and absorbent sheet manufacturing method |
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| JP5152713B2 (en) * | 2007-09-13 | 2013-02-27 | 独立行政法人産業技術総合研究所 | Method and apparatus for modifying synthetic fibers or fiber products |
| WO2013154219A1 (en) | 2012-04-13 | 2013-10-17 | 주식회사 엘지화학 | Method for preparing superabsorbent polymer |
| CN102828376B (en) * | 2012-09-20 | 2014-09-24 | 广东省均安牛仔服装研究院 | Ultraviolet-light photo-curing shaping equipment for crumpling and shaping jeans and crumpling, shaping and finishing method with equipment |
| CN106420170A (en) * | 2016-11-25 | 2017-02-22 | 泉州联合纸业有限公司 | Antibacterial layer forming device and method for paper diaper production line |
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| US4145248A (en) * | 1977-10-13 | 1979-03-20 | Monsanto Company | Air drying process |
| US5972505A (en) * | 1989-04-04 | 1999-10-26 | Eastman Chemical Company | Fibers capable of spontaneously transporting fluids |
| US6417425B1 (en) * | 2000-02-01 | 2002-07-09 | Basf Corporation | Absorbent article and process for preparing an absorbent article |
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