JP2009274302A - Waste ink absorbent sheet and ink jet recording device having the same - Google Patents
Waste ink absorbent sheet and ink jet recording device having the same Download PDFInfo
- Publication number
- JP2009274302A JP2009274302A JP2008126860A JP2008126860A JP2009274302A JP 2009274302 A JP2009274302 A JP 2009274302A JP 2008126860 A JP2008126860 A JP 2008126860A JP 2008126860 A JP2008126860 A JP 2008126860A JP 2009274302 A JP2009274302 A JP 2009274302A
- Authority
- JP
- Japan
- Prior art keywords
- waste ink
- water
- absorbing sheet
- jet recording
- absorbent resin
- 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
Links
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- 238000004821 distillation Methods 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
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- 238000005886 esterification reaction Methods 0.000 description 1
- CYKDLUMZOVATFT-UHFFFAOYSA-N ethenyl acetate;prop-2-enoic acid Chemical compound OC(=O)C=C.CC(=O)OC=C CYKDLUMZOVATFT-UHFFFAOYSA-N 0.000 description 1
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- 150000002170 ethers Chemical class 0.000 description 1
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- 229910052734 helium Inorganic materials 0.000 description 1
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- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
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- 239000004611 light stabiliser Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
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- 150000004706 metal oxides Chemical class 0.000 description 1
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
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- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 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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- 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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- 239000011780 sodium chloride Substances 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
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- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Ink Jet (AREA)
Abstract
Description
本発明は、廃インク吸収シート及びこれを具備するインクジェット式記録装置に関する。 The present invention relates to a waste ink absorbing sheet and an ink jet recording apparatus including the same.
従来から、インク滴をノズルから吐出する記録ヘッドを備えたインクジェット式記録装置が広く知られている。
このようなインクジェット式の記録装置は、記録ヘッドが搭載されたキャリッジを具備しており、キャリッジを記録媒体に対して相対的に移動させ、記録媒体を搬送させ、同時にノズルからインクを吐出させることにより印刷を行うようになされている。
このようなインクジェット式記録装置は、通常、廃インクを回収し、保持するタンクを具備している(例えば、特許文献1、2参照。)。
このような廃インク用のタンクの内部には、所定の吸収材が配設されており、廃インクを吸収・保持するようになされている。また、タンク上面には通気孔が設けられており、吸収材の通気性を確保して、廃インクを蒸発させ、吸液能力を維持するようになされている。
2. Description of the Related Art Conventionally, ink jet recording apparatuses including a recording head that discharges ink droplets from nozzles are widely known.
Such an ink jet recording apparatus has a carriage on which a recording head is mounted, and moves the carriage relative to the recording medium to convey the recording medium and simultaneously eject ink from the nozzles. The printing is performed according to the above.
Such an ink jet recording apparatus usually includes a tank that collects and holds waste ink (see, for example, Patent Documents 1 and 2).
A predetermined absorbing material is disposed inside the waste ink tank, and absorbs and holds the waste ink. Further, a vent hole is provided on the upper surface of the tank so as to ensure the air permeability of the absorbent material, evaporate the waste ink, and maintain the liquid absorption capability.
しかしながら、インクジェット式記録装置を輸送する際に、傾いたり転倒したりすると、前記タンク内の廃インクが通気孔から漏れ出すという不都合が生じていた。
そこで本発明においては、装置の傾斜時、転倒時にも廃インクの流出が効果的に回避できる吸液性に優れた廃インク吸収シート及びそれを備えたインクジェット記録装置を提供することを目的とした。
However, when the ink jet recording apparatus is transported, if it is tilted or falls, there is a disadvantage that waste ink in the tank leaks out from the vent hole.
Accordingly, an object of the present invention is to provide a waste ink absorbing sheet excellent in liquid absorbency that can effectively avoid outflow of waste ink even when the apparatus is tilted or falls, and an ink jet recording apparatus including the same. .
請求項1の発明においては、インクジェット式記録装置の廃インク収納機構に配置される廃インク吸収シートであって、基材に吸水性樹脂が担持されている廃インク吸収シートを提供する。 According to a first aspect of the present invention, there is provided a waste ink absorbing sheet disposed in a waste ink storage mechanism of an ink jet recording apparatus, wherein the waste ink absorbing sheet has a water absorbent resin supported on a base material.
請求項2の発明においては、前記吸水性樹脂は、側鎖に酸基を有し、当該酸基のうちの50%以上が中和されている化合物である請求項1に記載の廃インク吸収シートを提供する。 According to a second aspect of the present invention, the water-absorbing resin is a compound having an acid group in a side chain and neutralizing 50% or more of the acid group. Provide a sheet.
請求項3の発明においては、前記酸基がカルボン酸基であり、当該カルボン酸基のうちの50%以上が、アンモニウム塩となっている請求項2に記載の廃インク吸収シートを提供する。 According to a third aspect of the present invention, there is provided the waste ink absorbing sheet according to the second aspect, wherein the acid group is a carboxylic acid group, and 50% or more of the carboxylic acid group is an ammonium salt.
請求項4の発明においては、前記吸水性樹脂が、ポリアクリル酸アンモニウム塩を主体とする共重合体である請求項1乃至3のいずれか一項に記載の廃インク吸収シートを提供する。 According to a fourth aspect of the present invention, there is provided the waste ink absorbing sheet according to any one of the first to third aspects, wherein the water-absorbing resin is a copolymer mainly composed of ammonium polyacrylate.
請求項5の発明においては、前記基材が、布及び/又は紙により構成されている請求項1乃至4のいずれか一項に記載の廃インク吸収シートを提供する。 According to a fifth aspect of the present invention, there is provided the waste ink absorbing sheet according to any one of the first to fourth aspects, wherein the substrate is made of cloth and / or paper.
請求項6の発明においては、請求項1乃至5のいずれか一項に記載の廃インク吸収シートを具備するインクジェット式記録装置であって、インクを吐出するノズルと、当該ノズルから回収された廃インクを保持する廃インク収納機構とを具備し、前記廃インク吸収シートが、前記廃インク収納機構に配置されているインクジェット式記録装置を提供する。 According to a sixth aspect of the present invention, there is provided an ink jet recording apparatus comprising the waste ink absorbing sheet according to any one of the first to fifth aspects, wherein a nozzle that ejects ink and a waste recovered from the nozzle. And a waste ink storage mechanism for holding ink, wherein the waste ink absorbing sheet is disposed in the waste ink storage mechanism.
本発明によれば、インクジェット式記録装置が傾斜あるいは転倒したりした場合にも、廃インクの外部への流出が効果的に回避できる。 According to the present invention, waste ink can be effectively prevented from flowing out even when the ink jet recording apparatus is inclined or falls.
以下、本発明を実施するための最良の形態(以下、本実施の形態)について詳細に説明する。なお、本発明は、本実施の形態に限定されるものではなく、要旨の範囲内で種々変形して実施することができる。 Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as the present embodiment) will be described in detail. The present invention is not limited to the present embodiment, and can be implemented with various modifications within the scope of the gist.
本実施の形態における廃インク吸収シートは、インクジェット式記録装置の廃インク収納機構に配置されるものであり、基材に吸水性樹脂が担持された構成を有している。 The waste ink absorbing sheet in the present embodiment is disposed in the waste ink storage mechanism of the ink jet recording apparatus, and has a configuration in which a water-absorbing resin is supported on a base material.
(吸水性樹脂)
吸水性樹脂は特に限定されないが、側鎖に酸基を有した化合物よりなるものであることが好ましく、酸基はカルボン酸基であることがさらに好ましい。酸基は50%以上が塩の形で中和されていることが好ましく、アンモニウム塩となっていることがさらに好ましい。
吸水性樹脂の側鎖に酸基を有していると、液体を吸収した時に、酸基同士の静電反発が起こり、吸収速度が速くなるという効果を発揮する。
また、酸基が中和されていると、浸透圧により液体が吸水性樹脂内部に吸収されるようになる。特にアンモニウム塩は水への親和性が高く、吸収量の増加が図られるため好ましい。
(Water absorbent resin)
The water absorbent resin is not particularly limited, but is preferably made of a compound having an acid group in the side chain, and the acid group is more preferably a carboxylic acid group. It is preferable that 50% or more of the acid groups are neutralized in the form of a salt, more preferably an ammonium salt.
When an acid group is present in the side chain of the water-absorbent resin, when the liquid is absorbed, an electrostatic repulsion between the acid groups occurs and the effect of increasing the absorption rate is exhibited.
Further, when the acid group is neutralized, the liquid is absorbed into the water-absorbent resin by osmotic pressure. In particular, an ammonium salt is preferable because of its high affinity for water and an increase in absorption.
吸水性樹脂の具体例としては、ポリアクリル酸部分中和物架橋体(例えば特開昭55−84304号公報参照)、澱粉−アクリロニトリルグラフト重合体の加水分解物(例えば特公昭49−43395号公報参照)、澱粉−アクリル酸グラフト重合体の中和物(例えば特開昭51−125468号公報参照)、酢酸ビニル−アクリル酸エステル共重合体の鹸化物(例えば特開昭52−14689号公報参照)、アクリロニトリル共重合体もしくはアクリルアミド共重合体の加水分解物(例えば特公昭53−15959号公報参照)、ポリグルタミン酸塩(例えば特開2003−192794号公報参照)等が知られている。
ポリアクリル酸塩共重合体やポリアクリル酸部分中和物架橋体が吸収性能に優れており好ましい。
Specific examples of the water-absorbing resin include a crosslinked polyacrylic acid partially neutralized product (for example, see JP-A-55-84304) and a hydrolyzate of starch-acrylonitrile graft polymer (for example, JP-B-49-43395). ), Neutralized product of starch-acrylic acid graft polymer (for example, see JP-A-51-125468), saponified product of vinyl acetate-acrylic acid ester copolymer (for example, see JP-A-52-14689) ), Hydrolyzates of acrylonitrile copolymers or acrylamide copolymers (see, for example, Japanese Patent Publication No. 53-15959), polyglutamates (see, for example, JP-A-2003-192794), and the like.
Polyacrylate copolymers and crosslinked polyacrylic acid partial neutralized products are preferred because of their excellent absorption performance.
前記ポリアクリル酸部分中和物架橋体の中和前の状態であるポリアクリル酸架橋体は、ポリマー分子鎖中における繰り返し単位の50mol%以上がカルボキシル基含有単位となっていることが好ましく、80mol%以上がより好ましく、90mol%以上がさらに好ましい。
繰り返し単位のうちのカルボキシル基含有単位が50mol%未満であると、吸収性能の低下が見られるため好ましくない。
The polyacrylic acid crosslinked product in a state before neutralization of the crosslinked polyacrylic acid partially neutralized product preferably has 50 mol% or more of repeating units in the polymer molecular chain as carboxyl group-containing units, % Or more is more preferable, and 90 mol% or more is more preferable.
If the carboxyl group-containing unit in the repeating unit is less than 50 mol%, it is not preferable because a decrease in absorption performance is observed.
ポリマー分子鎖中のカルボキシル基は、塩の形で部分中和されていることが好ましい。
塩を形成するものとしては、例えば、ナトリウム、カリウム、リチウム等のアルカリ金属、アンモニア等の含窒素塩基性物が挙げられる。
カルボキシル基の50%以上が中和されていることが好ましく、70%以上が中和されていることがさらに好ましい。
塩の種類としては、アンモニアを含む少なくとも1種類以上で部分中和されることが好ましく、アンモニア単独で部分中和されることが最も好ましい。
ポリマー分子鎖中のカルボキシル基中和塩のうちの50mol%以上がアンモニウム塩であることが好ましく、70mol%以上がより好ましく、90mol%以上がさらに好ましく、全てアンモニウム塩であることがさらにより好ましい。
アンモニウム塩の割合が高いと吸水性能が高くなり、また吸水性樹脂を支持する所定の基材との接着性が良好になる。
なお、アンモニウム塩の割合は、吸水性樹脂中の全窒素原子量を求めることにより算出できる。吸水性樹脂中の全窒素原子量はケルダール法により求められる。
The carboxyl group in the polymer molecular chain is preferably partially neutralized in the form of a salt.
As what forms a salt, nitrogen-containing basic substances, such as alkali metals, such as sodium, potassium, lithium, and ammonia, are mentioned, for example.
50% or more of the carboxyl groups are preferably neutralized, and more preferably 70% or more are neutralized.
As a kind of salt, it is preferable to be partially neutralized with at least one kind including ammonia, and most preferably partially neutralized with ammonia alone.
Of the carboxyl group neutralized salts in the polymer molecular chain, 50 mol% or more is preferably an ammonium salt, more preferably 70 mol% or more, still more preferably 90 mol% or more, and even more preferably all ammonium salts.
When the proportion of the ammonium salt is high, the water absorption performance is improved, and the adhesiveness with a predetermined base material that supports the water absorbent resin is improved.
The proportion of the ammonium salt can be calculated by determining the total amount of nitrogen atoms in the water absorbent resin. The total amount of nitrogen atoms in the water absorbent resin is determined by the Kjeldahl method.
吸水性樹脂は、下記の単量体により構成することができる。
例えば、(メタ)アクリル酸、エタアクリル酸、イタコン酸、マレイン酸、クロトン酸、フマル酸、ソルビン酸、けい皮酸、それらの無水物、不飽和カルボン酸単量体の中和塩が挙げられる。特に(メタ)アクリル酸の中和塩が好ましい。
中和塩としては、リチウム、ナトリウム、カリウム等のアルカリ金属塩、アンモニア等の含窒素塩基性物質が好ましい。
また、各種単量体との共重合体により構成されたものであってもよい。
共重合体を形成する不飽和単量体としては、(メタ)アクリル酸、エタアクリル酸、イタコン酸、マレイン酸、クロトン酸、ソルビン酸、けい皮酸、それらの無水物、ビニルスルフォン酸、アリルスルフォン酸、スチレンスルフォン酸、ビニルトルエンフルフォン酸、2−(メタ)アクリルアミド−2−メチルプロパンスルフォン酸、2−(メタ)アクリロイルエタンスルフォン酸、2−(メタ)アクリロイルプロパンスルフォン酸、2−ヒドロキシルエチルアクリロイルオフォスフェート、2−ヒドロキシルエチルメタクリロイルフォスフェート、フェニル−2−アクリロイロキシエチルフォスフェート、ビニルリン酸等のアニオン性不飽和単量体及びその塩、アクリルアミド、メタアクリルアミド、N−エチル(メタ)アクリルアミド、N−n−プロピル(メタ)アクリルアミド、N−イソプロピル(メタ)アクリルアミド、N,N−ジメチル(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、2−ヒドロキシプロピル(メタ)アクリレート、メトキシポリエチレングリコール(メタ)アクレリート、ポリエチレングリコールモノ(メタ)アクリレート、N−ビニルピロリドン、N−アクリロイルピペジリン、N−アクリロイルピロリジン等のノニオン性の親水性基含有不飽和単量体が挙げられる。
また、メチル(メタ)アクリレート、エチル(メタ)アクリレート、酢酸ビニル等のように、重合後の官能基の加水分解によって吸水性樹脂を形成する親水性単量体も挙げられる。
また更に、その他の所定の疎水性単量体を併用することもできる。例えば、スチレン、塩化ビニル、ブタジエン、イソブテン、エチレン、プロピレン、ステアリル(メタ)アクリレート、ラウリル(メタ)アクリレート等が挙げられる。これらは単独で用いてもよく、2種以上を併用してもよい。
The water absorbent resin can be composed of the following monomers.
Examples include (meth) acrylic acid, ethacrylic acid, itaconic acid, maleic acid, crotonic acid, fumaric acid, sorbic acid, cinnamic acid, their anhydrides, and neutralized salts of unsaturated carboxylic acid monomers. . Particularly preferred is a neutralized salt of (meth) acrylic acid.
As the neutralized salt, alkali metal salts such as lithium, sodium and potassium, and nitrogen-containing basic substances such as ammonia are preferable.
Moreover, what was comprised by the copolymer with various monomers may be used.
The unsaturated monomers that form the copolymer include (meth) acrylic acid, ethacrylic acid, itaconic acid, maleic acid, crotonic acid, sorbic acid, cinnamic acid, their anhydrides, vinyl sulfonic acid, allyl Sulfonic acid, styrene sulfonic acid, vinyl toluene sulfonic acid, 2- (meth) acrylamido-2-methylpropane sulfonic acid, 2- (meth) acryloylethane sulfonic acid, 2- (meth) acryloylpropane sulfonic acid, 2-hydroxyl Anionic unsaturated monomers such as ethyl acryloyl phosphate, 2-hydroxylethyl methacryloyl phosphate, phenyl-2-acryloyloxyethyl phosphate, vinyl phosphate and salts thereof, acrylamide, methacrylamide, N-ethyl (meth) Acrylamide, -N-propyl (meth) acrylamide, N-isopropyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, methoxypolyethylene glycol (meta ) Nonionic hydrophilic group-containing unsaturated monomers such as acrylate, polyethylene glycol mono (meth) acrylate, N-vinylpyrrolidone, N-acryloylpiperidine, N-acryloylpyrrolidine and the like.
Moreover, the hydrophilic monomer which forms a water absorbing resin by hydrolysis of the functional group after superposition | polymerization like methyl (meth) acrylate, ethyl (meth) acrylate, vinyl acetate etc. is also mentioned.
Furthermore, other predetermined hydrophobic monomers can be used in combination. Examples thereof include styrene, vinyl chloride, butadiene, isobutene, ethylene, propylene, stearyl (meth) acrylate, lauryl (meth) acrylate, and the like. These may be used alone or in combination of two or more.
上記各種単量体中には、架橋剤を共存させてもよい。
架橋方法としては、縮合型架橋剤を用いて樹脂中の官能基と反応させて架橋させる方法、不飽和単量体重合性の架橋剤を用いて不飽和単量体と共重合することにより架橋させる方法、樹脂に電子線や放射線を照射することにより架橋させる方法等が挙げられる。この中でも縮合型架橋を用いる方法が好ましく、樹脂の官能基と反応する縮合型架橋剤の共存下で、重合性の架橋剤と不飽和単量体を共重合させる方法がより好ましい。
A crosslinking agent may coexist in the various monomers.
As a crosslinking method, a method of crosslinking by reacting with a functional group in a resin using a condensation type crosslinking agent, or a crosslinking by copolymerizing with an unsaturated monomer using an unsaturated monomer polymerizable crosslinking agent. And a method of crosslinking by irradiating the resin with an electron beam or radiation. Among these, a method using condensation type crosslinking is preferred, and a method of copolymerizing a polymerizable crosslinking agent and an unsaturated monomer in the presence of a condensation type crosslinking agent that reacts with a functional group of the resin is more preferred.
縮合型架橋剤としては、例えば、エチレングリコールジグリシジルエーテル、トリメチロールプロパントリグリシジルエーテル、(ポリ)グリセリンポリグリシジルエーテル、ジグリセリンポリグリシジルエーテル、プロピ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化合物;(ポリ)グリセリン、(ポリ)エチレングリコール、プロピレングリコール、1,3−プロパンジオール、ポリオキシエチレングリコール、トリエチレングリコール、テトラエチレングリコール、ジエタノールアミン、トリエタノールアミン等の多価アルコール類;エチレンジアミン、ジエチレンジアミン、ポリエチレンイミン、ヘキサメチレンジアミン等の多価アミン類;亜鉛、カルシウム、マグネシウム、アルミニウム等の多価イオン等が挙げられる。これらは単独で用いてもよく、2種以上を併用してもよい。
不飽和単量体重合性の架橋剤としては、例えば、ジエチレングリコールジアクリレート、N,N‘−メチレンビスアクリルアミド、ポリエチレングリコールジアクリレート、ポリプロピレングリコールジアクリレート、トリメチロールプロパンジアリルエーテル、アリルグリシジルエーテル、ペンタエリスリトールトリアリルエーテル、ペンタエリスリトールジアクリレートモノステアレート、ビスフェノールジアクリレート、イソシアヌル酸ジアクリレート、テトラアリルオキシエタン、ジアリルオキシ酢酸塩等が挙げられる。これらは単独で用いてもよく、2種以上を併用してもよい。
Examples of the condensation type cross-linking agent include glycidyl ether compounds such as ethylene glycol diglycidyl ether, trimethylolpropane triglycidyl ether, (poly) glycerin polyglycidyl ether, diglycerin polyglycidyl ether, and propylene glycol diglycidyl ether; (poly) Polyhydric alcohols such as glycerin, (poly) ethylene glycol, propylene glycol, 1,3-propanediol, polyoxyethylene glycol, triethylene glycol, tetraethylene glycol, diethanolamine, triethanolamine; ethylenediamine, diethylenediamine, polyethyleneimine And polyvalent amines such as hexamethylenediamine; polyvalent ions such as zinc, calcium, magnesium and aluminum It is. These may be used alone or in combination of two or more.
Examples of unsaturated monomer polymerizable crosslinking agents include diethylene glycol diacrylate, N, N′-methylenebisacrylamide, polyethylene glycol diacrylate, polypropylene glycol diacrylate, trimethylolpropane diallyl ether, allyl glycidyl ether, and pentaerythritol. Examples include triallyl ether, pentaerythritol diacrylate monostearate, bisphenol diacrylate, isocyanuric acid diacrylate, tetraallyloxyethane, diallyloxyacetate, and the like. These may be used alone or in combination of two or more.
上記各種単量体を重合させるために用いる溶媒は、溶解性に優れたものであれば特に限定されない。水、エタノール、メタノール、アセトン等の親水性溶媒を単独もしくは複数混合して使用してもよい。また、必要に応じて塩化ナトリウム等の塩類や、pHコントロールを目的としてアンモニア等の塩基性化合物を用いてもよく、逆相懸濁重合の際には懸濁剤を添加してもよい。 The solvent used for polymerizing the various monomers is not particularly limited as long as it has excellent solubility. Hydrophilic solvents such as water, ethanol, methanol, and acetone may be used alone or in combination. If necessary, a salt such as sodium chloride or a basic compound such as ammonia may be used for the purpose of pH control, and a suspending agent may be added in the reverse phase suspension polymerization.
重合方法については特に限定されるものではなく、例えば、水溶液重合、逆相懸濁重合、逆相乳化重合、噴霧重合、ベルト重合等の一般に広く用いられている方法をいずれも適用できる。
重合開始方法についても特に限定されるものではなく、例えば、ラジカル重合開始剤による重合、放射線、電子線等を照射することによる重合、光増感剤による紫外線重合を行うこともできる。
ラジカル重合開始剤としては、例えば、過硫酸カリウム、過硫酸アンモニウム、過硫酸ナトリウム等の過硫酸塩;過酸化水素;クメンハイドロパーオキサイド、t−ブチルハイドロパーオキサイド、過酢酸等の有機化酸化物等の公知の開始剤を適用できる。
また、酸化性ラジカル重合開始剤を用いる場合には、L−アスコルビン酸、ロンガリット等の還元剤を併用してもよい。
The polymerization method is not particularly limited, and any of generally widely used methods such as aqueous solution polymerization, reverse phase suspension polymerization, reverse phase emulsion polymerization, spray polymerization, and belt polymerization can be applied.
The polymerization initiation method is not particularly limited, and for example, polymerization using a radical polymerization initiator, polymerization by irradiation with radiation, an electron beam, or ultraviolet polymerization using a photosensitizer can be performed.
Examples of the radical polymerization initiator include persulfates such as potassium persulfate, ammonium persulfate and sodium persulfate; hydrogen peroxide; organic oxides such as cumene hydroperoxide, t-butyl hydroperoxide and peracetic acid. The known initiators can be applied.
When an oxidizing radical polymerization initiator is used, a reducing agent such as L-ascorbic acid or Rongalite may be used in combination.
重合を開始する前段階として、予め単量体溶液中の脱酸素操作を行っておくことが好ましい。具体的には、不活性ガスによるバブリング等により溶存酸素を取り除く方法が挙げられる。
また、重合を行う反応器内の雰囲気を予め窒素やヘリウム等の不活性ガスにより置換しておくことが好ましい。反応器内は減圧、常圧、加圧のいずれであってもよい。重合開始温度は通常0〜100℃の範囲で行うこととし、20〜70℃の範囲がより好ましい。重合開始温度が高すぎると、開始剤を加える前から熱による重合が起こってしまうため好ましくない。一方において、重合開始温度が低すぎると、反応開始に時間がかかりすぎるため好ましくない。
It is preferable to perform a deoxygenation operation in the monomer solution in advance as a step before starting the polymerization. Specifically, there is a method of removing dissolved oxygen by bubbling with an inert gas.
Moreover, it is preferable that the atmosphere in the reactor for carrying out the polymerization is previously substituted with an inert gas such as nitrogen or helium. The inside of the reactor may be any of reduced pressure, normal pressure, and increased pressure. The polymerization start temperature is usually in the range of 0 to 100 ° C, and the range of 20 to 70 ° C is more preferable. When the polymerization start temperature is too high, polymerization by heat occurs before the initiator is added, which is not preferable. On the other hand, if the polymerization start temperature is too low, it takes too much time to start the reaction, which is not preferable.
重合反応中の反応器内の温度に関しては、適宜外部から冷却や加熱を施すことにより温度制御を行ってもよい。
重合反応中における昇温速度や最高温度については、特に問題とはならず、最高温度が100℃を超えても問題はない。通常20〜140℃で、40〜120℃の範囲が好ましい。
Regarding the temperature in the reactor during the polymerization reaction, the temperature may be controlled by appropriately cooling or heating from the outside.
There is no particular problem with the rate of temperature rise or the maximum temperature during the polymerization reaction, and there is no problem even if the maximum temperature exceeds 100 ° C. Usually, it is 20-140 degreeC and the range of 40-120 degreeC is preferable.
重合反応における単量体溶液の濃度は、10〜80%が好ましく、30〜70%がより好ましい。
単量体の濃度が高すぎると、反応が暴走しやすく望ましくない。一方において濃度が薄すぎると、反応に時間がかかりすぎ、その後重合体を取り出す乾燥工程にも負荷がかかるため好ましくない。
The concentration of the monomer solution in the polymerization reaction is preferably 10 to 80%, more preferably 30 to 70%.
If the monomer concentration is too high, the reaction tends to run away, which is undesirable. On the other hand, if the concentration is too low, it takes too much time for the reaction, and the drying process for taking out the polymer is also burdened, which is not preferable.
重合反応時間は、反応溶液からの発熱が止まる時間付近に設定することが好ましい。
重合を行った後には、後工程として、乾燥工程、後架橋工程等を行い、これらは加熱工程であるので、反応溶液からの発熱が停止する前段階で重合反応を終了させてもよい。
また、必要に応じて、発熱終了後に、数時間加温、保温してもよい。
The polymerization reaction time is preferably set in the vicinity of the time when heat generation from the reaction solution stops.
After the polymerization, as a post-process, a drying process, a post-crosslinking process, and the like are performed. Since these are heating processes, the polymerization reaction may be terminated at a stage before the heat generation from the reaction solution stops.
Moreover, you may heat and hold for several hours after completion | finish of heat_generation | fever as needed.
重合反応終了後、重合体が含水ゲルとして得られる場合には、乾燥処理を行う。
乾燥処理の方法は、特に限定されるものではないが、例えば、共沸脱水、流動乾燥、熱風乾燥、真空乾燥等が適用でき、特に熱風乾燥、真空乾燥が好適である。
これらの乾燥処理により、含水率を30重量%以下、好ましくは10重量%以下となるようにする。
乾燥処理においては、含水ゲルを粗解砕しておき、表面積を増やしてから行うことが好ましい。
乾燥処理温度は、70℃〜180℃の範囲が好ましく、100〜140℃の範囲がより好ましい。
When the polymer is obtained as a hydrogel after the polymerization reaction is completed, a drying process is performed.
The method for the drying treatment is not particularly limited, and for example, azeotropic dehydration, fluidized drying, hot air drying, vacuum drying and the like can be applied, and hot air drying and vacuum drying are particularly preferable.
By these drying treatments, the water content is adjusted to 30% by weight or less, preferably 10% by weight or less.
In the drying treatment, it is preferable that the hydrogel is roughly crushed to increase the surface area.
The drying treatment temperature is preferably in the range of 70 ° C to 180 ° C, more preferably in the range of 100 to 140 ° C.
上記のように乾燥処理を行った後、任意処理として重合体を粉砕し、分級を行うことによって粒子径の調整を行う。
ポリアクリル酸架橋体である場合には、所定の粒子径にコントロールした後に、さらに加熱処理を施してもよい。この加熱処理においては、カルボキシル基と反応しうる官能基を2個以上有する化合物を共存させておくことが好ましい。このカルボキシル基と反応しうる官能基を2個以上有する化合物は、重合反応の前段階に加えてもよいし、加熱処理の前段階として加えてもよい。加熱処理の前段階に加える場合には、水、アルコール類、エーテル類等の親水性溶媒に溶解させて、表面に散布するようにして加えることが好ましい。
加熱処理温度は特に限定されないが、120〜250℃の範囲が好ましく、150〜240℃の範囲がより好ましく、170〜230℃の範囲がさらに好ましい。
加熱処理は、乾燥工程終了後に連続的に同一の装置内で実施してもよく、乾燥工程とは独立の工程としてもよい。
加熱処理は、公知の乾燥機や加熱炉を用いて行うことができる。例えば、溝型混合乾燥機、ロータリー乾燥機、ディスク乾燥機、流動層乾燥機、気流型乾燥機、赤外線乾燥機等が挙げられる。
After performing the drying treatment as described above, the particle size is adjusted by pulverizing and classifying the polymer as an optional treatment.
In the case of a polyacrylic acid crosslinked body, it may be further subjected to heat treatment after controlling to a predetermined particle diameter. In this heat treatment, it is preferable to coexist a compound having two or more functional groups capable of reacting with a carboxyl group. The compound having two or more functional groups capable of reacting with a carboxyl group may be added to the pre-stage of the polymerization reaction or may be added to the pre-stage of the heat treatment. In the case of adding to the previous stage of the heat treatment, it is preferable to add it by dissolving it in a hydrophilic solvent such as water, alcohols, ethers, etc. and spraying it on the surface.
Although heat processing temperature is not specifically limited, The range of 120-250 degreeC is preferable, The range of 150-240 degreeC is more preferable, The range of 170-230 degreeC is further more preferable.
The heat treatment may be performed continuously in the same apparatus after the drying step, or may be a step independent of the drying step.
The heat treatment can be performed using a known dryer or heating furnace. For example, a groove type mixing dryer, a rotary dryer, a disk dryer, a fluidized bed dryer, an airflow dryer, an infrared dryer and the like can be mentioned.
吸水性樹脂には、必要に応じて、消臭剤、香料、各種無機粉末、発泡剤、顔料、染料、抗菌剤、親水性短繊維、可塑剤、粘着剤、界面活性剤、肥料、酸化剤、還元剤、キレート剤、酸化防止剤、熱安定剤、紫外線吸収剤、光安定剤、水、塩類等を添加してもよい。
前記無機粉末としては、例えば、水及び親水性有機溶媒に対して不活性な各種無機化合物の微粒子、粘土鉱物の微粒子等が挙げられる。特に、水に対して適度な親和性を有し、かつ、水に不溶、あるいは難溶のものが好ましい。例えば、二酸化珪素や酸化チタン等の金属酸化物、天然ゼオライトや合成ゼオライト等の珪酸(塩)、カオリン、タルク、クレー、ベントナイト等が挙げられる。
前記無機粉末の使用量は、吸水性樹脂100重量部に対して0.001〜10重量部が好ましく、0.01〜5重量部がより好ましい。
吸水性樹脂と無機粉末とを混合する方法は特に限定されるものではなく、例えば、ドライブレンド法、湿式混合法等により行うことができる。
For water-absorbent resin, deodorant, fragrance, various inorganic powders, foaming agent, pigment, dye, antibacterial agent, hydrophilic short fiber, plasticizer, adhesive, surfactant, fertilizer, oxidizer as required Further, a reducing agent, a chelating agent, an antioxidant, a heat stabilizer, an ultraviolet absorber, a light stabilizer, water, salts, and the like may be added.
Examples of the inorganic powder include fine particles of various inorganic compounds that are inert to water and hydrophilic organic solvents, fine particles of clay minerals, and the like. In particular, those having an appropriate affinity for water and insoluble or hardly soluble in water are preferred. Examples thereof include metal oxides such as silicon dioxide and titanium oxide, silicic acid (salts) such as natural zeolite and synthetic zeolite, kaolin, talc, clay, bentonite and the like.
The amount of the inorganic powder used is preferably 0.001 to 10 parts by weight and more preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the water absorbent resin.
The method for mixing the water-absorbent resin and the inorganic powder is not particularly limited, and can be performed by, for example, a dry blend method, a wet mix method, or the like.
(廃インク吸収シート)
本実施の形態における廃インク吸収シートは、所定の基材と、上述した吸水性樹脂を少なくとも具備しているものとする。
基材はシート形状を有しており、従来公知の材料を適用できる。紙及び/又は布が好適である。
紙とは、JISP0001で定義される広義の意味での紙のことを指し、布とはJISL0206で定義されるシート状繊維製品の総称である。
布は、シートを形成する手段によって織物、編物、組み物、レース、網、不織布に分類されるが、織物、編物、不織布が好ましく、不織布がより好ましい。
紙及び/又は布は、形態安定性に優れているため好ましい。
不織布とは、JIS L 0222により定義される。
繊維素材としては、天然繊維、合成繊維のいずれでもよく、組み合わせてもよい。
繊維の長さは、短繊維でも長繊維でもよい。親水性付与を行って強化してもよい。なお、基材を構成する繊維は、親水性のものを使用した方が、全体としての吸水性、通水性に優れたものとなるため、好ましい。また、短繊維よりも連続長繊維の方が通液性にすぐれるため好ましい。
親水性の基材のなかでも、特にセルロース系の基材が好ましい。
セルロース系基材とは、セルロースを主原料とした布および/または紙のことを表し、この中でもセルロース系繊維からなる布および/または紙、特に、セルロース不織布が好ましい。セルロースは、例えばエステル化やエーテル化等の処理により誘導体化されたものを使用してもよい。また、他の繊維と混ぜたものでもよい。セルロースとしては、綿、麻などの天然繊維、レーヨン、ポリノジック、リヨセル、キュプラなどの再生繊維などがある。繊維としては再生繊維の方が好ましく、一年草である綿実を再生繊維化した繊維がさらに好ましい。
(Waste ink absorbing sheet)
The waste ink absorbing sheet in the present embodiment is assumed to include at least a predetermined base material and the above-described water-absorbing resin.
The base material has a sheet shape, and conventionally known materials can be applied. Paper and / or cloth is preferred.
Paper refers to paper in a broad sense defined by JISP0001, and cloth is a generic term for sheet-like fiber products defined by JISL0206.
The cloth is classified into a woven fabric, a knitted fabric, a braided fabric, a lace, a net, and a non-woven fabric according to the means for forming the sheet, and the woven fabric, the knitted fabric and the non-woven fabric are preferable, and the non-woven fabric is more preferable.
Paper and / or cloth is preferred because of its excellent shape stability.
Nonwoven fabric is defined by JIS L 0222.
The fiber material may be either natural fiber or synthetic fiber, or may be combined.
The length of the fiber may be short fiber or long fiber. It may be strengthened by imparting hydrophilicity. In addition, since the direction which uses the hydrophilic thing for the fiber which comprises a base material becomes the thing excellent in the water absorption and water permeability as a whole, it is preferable. In addition, continuous long fibers are more preferable than short fibers because they are superior in liquid permeability.
Of the hydrophilic substrates, cellulose-based substrates are particularly preferable.
The cellulosic substrate means a fabric and / or paper made of cellulose as a main raw material, and among these, a fabric and / or paper made of cellulosic fibers, particularly a cellulose nonwoven fabric is preferred. Cellulose may be derivatized by treatment such as esterification or etherification. Moreover, what was mixed with the other fiber may be used. Examples of cellulose include natural fibers such as cotton and hemp, and regenerated fibers such as rayon, polynosic, lyocell, and cupra. As the fiber, a regenerated fiber is preferable, and a fiber obtained by regenerating a cotton seed which is an annual grass is more preferable.
本実施の形態における廃インク吸収シートを構成する基材の形状については、特に限定されるものではない。
厚さは、0.001mm〜1cmが好ましく、0.01mm〜5mmがより好ましく、0.05mm〜3mmがさらに好ましく、0.1mm〜1mmがさらにより好ましい。
重量は、0.1g/m2〜1kg/m2が好ましく、0.5g/m2〜500kg/m2がより好ましく、1g/m2〜100g/m2がさらに好ましい。
上記範囲とすることにより、実用上十分な強度が確保できる。
The shape of the substrate constituting the waste ink absorbing sheet in the present embodiment is not particularly limited.
The thickness is preferably 0.001 mm to 1 cm, more preferably 0.01 mm to 5 mm, further preferably 0.05 mm to 3 mm, and still more preferably 0.1 mm to 1 mm.
The weight is preferably 0.1 g / m 2 to 1 kg / m 2, more preferably 0.5 g / m 2 to 500 kg / m 2, and even more preferably 1 g / m 2 to 100 g / m 2.
By setting it in the above range, a practically sufficient strength can be secured.
本実施の形態における廃インク吸収シートは、上記基材に、上述した吸水性樹脂が直接接着されて担持されていることが好ましい。
全吸水性樹脂の粒子の50重量%以上が基材と直接接着していることが好ましい。
これにより、吸水性樹脂シートの位置が変化しにくく、高い吸水性能が安定して得られるようになる。
In the waste ink absorbing sheet in the present embodiment, it is preferable that the above-described water-absorbing resin is directly bonded to and supported on the base material.
It is preferable that 50% by weight or more of all water-absorbing resin particles are directly bonded to the base material.
Thereby, the position of the water absorbent resin sheet is unlikely to change, and high water absorption performance can be obtained stably.
本実施の形態における廃インク吸収シートにおいては、パルプ等の短繊維やその他シート状材料を併用することにより、吸収性能を調整してもよい。 In the waste ink absorbing sheet in the present embodiment, the absorbing performance may be adjusted by using short fibers such as pulp and other sheet-like materials in combination.
吸水性樹脂の粒子を基材に接着させる接着方法については、特に限定されるものではない。例えば、基材を構成する繊維の一部が吸水性樹脂中に取り込まれた状態となって両者が接着しているような形態が好ましい。
この場合、吸水性樹脂粒子中の50重量%以上に、基材を構成する繊維の一部が取り込まれた形態となっていることが好ましく、70重量%以上、さらには90重量%以上、最も好ましくは95重量%以上の吸水性樹脂がこの形態で接着していることが好ましい。
基材を構成する繊維の一部が、吸水性樹脂中に取り込まれた形態となって接着していると、吸水性樹脂が液体を吸収する時に繊維が通水路として機能し、吸収速度の向上が図られる。
The bonding method for bonding the water-absorbent resin particles to the substrate is not particularly limited. For example, a form in which a part of the fibers constituting the base material is taken into the water-absorbent resin and the two are bonded is preferable.
In this case, it is preferable that 50% by weight or more in the water-absorbent resin particles have a form in which a part of the fibers constituting the base material is taken in, 70% by weight or more, further 90% by weight or more, Preferably, 95% by weight or more of the water-absorbing resin is bonded in this form.
If some of the fibers that make up the substrate are bonded in the form of being taken into the water-absorbent resin, the fibers will function as a water passage when the water-absorbent resin absorbs liquid, improving the absorption rate Is planned.
なお、基材と吸水性樹脂粒子とが接着しているとは、基材に吸水性樹脂粒子が固定化されていて、実質的に基材と吸水性樹脂粒子の位置関係が変化しないことをいう。
具体的には、吸収性複合体の端を手で持ち固定し、接着粒子が存在する面を下にして、20cmの幅で1秒間に2往復の速さで1分間振って、脱離しない粒子を接着しているとする。
Note that the base material and the water-absorbing resin particles are bonded to each other when the water-absorbing resin particles are fixed to the base material and the positional relationship between the base material and the water-absorbing resin particles is not substantially changed. Say.
Specifically, the end of the absorptive composite is held and fixed by hand, and the surface on which the adhesive particles are present is faced down. Assume that the particles are bonded.
次に、具体的な実施例に基づいて説明する。
(吸水性樹脂粒子(1)の製造)
アクリル酸(和光純薬製、試薬特級品)を用意し、蒸留精製した。
アクリル酸100gを水91.02gに溶解した。
この水溶液を氷浴にて冷却し、液温30℃以下に保ちながら、25重量%のアンモニア水溶液117.94gを攪拌しながら徐々に加え、40重量%のアクリル酸アンモニウム水溶液を得た(中和率100%)。
300mlセパラブルフラスコに、上記40重量%アクリル酸アンモニウム水溶液を90g、N,N’−メチレンビスアクリルアミドを0.0187g添加した。
前記セパラブルフラスコは、ウォーターバスを用いて30℃の液温に保持した。
水溶液を窒素ガスでバブリングすることにより脱気し、反応系中を窒素置換した。
次に、42重量%グリセリン水溶液を、シリンジを用いて0.43g添加し、十分に攪拌した後に。それぞれ1gの水に溶かした30重量%過酸化水素水溶液0.0917gとロンガリット0.0415gを添加し、重合を開始した。
内部温度は30℃から開始して、反応開始5分で100℃まで上昇したことを確認した。
その後、内部温度が70℃に保たれるように水浴にて3時間加熱した。
重合終了後、セパラフラスコよりゲルを取り出し、粗解砕を行い、100℃にてイナートオーブンを用いて4時間の乾燥処理を行った。
前記乾燥処理後、ホモジナイザーにて粉砕し、篩い分けを行って、106μm未満、106〜212μm、212〜300μm、300〜425μm、425〜500μm、500〜600μm、600〜710μm、710〜850μm、850〜1200μm、1200〜1400μm、1400〜1700μm、1700〜2500μm、2500〜3000μm、3000μm以上に分級した。
上記工程により、吸水性樹脂粒子(1)が得られた。
この吸水性樹脂粒子の表面強度は0.5Nであった。
全体のアンモニウム塩濃度は96%、表面の塩濃度は90%、中心部の塩濃度は97%であった。
Next, a description will be given based on specific examples.
(Production of water-absorbent resin particles (1))
Acrylic acid (manufactured by Wako Pure Chemical Industries, special grade reagent) was prepared and purified by distillation.
100 g of acrylic acid was dissolved in 91.02 g of water.
The aqueous solution was cooled in an ice bath, and while maintaining the liquid temperature at 30 ° C. or lower, 117.94 g of a 25 wt% aqueous ammonia solution was gradually added with stirring to obtain a 40 wt% aqueous ammonium acrylate solution (neutralization). Rate 100%).
To a 300 ml separable flask, 90 g of the 40 wt% ammonium acrylate aqueous solution and 0.0187 g of N, N′-methylenebisacrylamide were added.
The separable flask was kept at a liquid temperature of 30 ° C. using a water bath.
The aqueous solution was deaerated by bubbling with nitrogen gas, and the reaction system was purged with nitrogen.
Next, after adding 0.43g of 42 weight% glycerol aqueous solution using a syringe and fully stirring. Polymerization was initiated by adding 0.0917 g of a 30 wt% aqueous hydrogen peroxide solution and 0.0415 g of Rongalite dissolved in 1 g of water.
It was confirmed that the internal temperature started from 30 ° C. and increased to 100 ° C. within 5 minutes from the start of the reaction.
Then, it heated for 3 hours with the water bath so that internal temperature might be maintained at 70 degreeC.
After completion of the polymerization, the gel was taken out from the Separa flask, roughly crushed, and dried at 100 ° C. using an inert oven for 4 hours.
After the drying treatment, the mixture is pulverized with a homogenizer and sieved to less than 106 μm, 106 to 212 μm, 212 to 300 μm, 300 to 425 μm, 425 to 500 μm, 500 to 600 μm, 600 to 710 μm, 710 to 850 μm, 850 to 850 It classified into 1200 micrometers, 1200-1400 micrometers, 1400-1700 micrometers, 1700-2500 micrometers, 2500-3000 micrometers, 3000 micrometers or more.
Water-absorbent resin particles (1) were obtained by the above process.
The surface strength of the water absorbent resin particles was 0.5N.
The total ammonium salt concentration was 96%, the surface salt concentration was 90%, and the central salt concentration was 97%.
(吸水性樹脂粒子(2)の製造)
25重量%のアンモニア水溶液117.94gに替えて、当量の水酸化ナトリウム水溶液を用いた。その他の条件は、前記吸水性樹脂粒子(1)と同様として吸水性樹脂粒子(2)を作製した。
(Production of water-absorbent resin particles (2))
Instead of 117.94 g of a 25 wt% aqueous ammonia solution, an equivalent aqueous sodium hydroxide solution was used. Other conditions were the same as those of the water absorbent resin particles (1), and water absorbent resin particles (2) were produced.
(基材)
旭化成せんい社製の「ベンリーゼ」(登録商標)を直径59.5mmの円形に切り取った。
重量を測定したところ、0.0796gであった。
ベンリーゼは、セルロース100%の連続長繊維不職布である。
吸水特性に優れており、また、連続長繊維であるため、含水時の強度も十分あり、液拡散性にも優れている。
(Base material)
“Benlyse” (registered trademark) manufactured by Asahi Kasei Fibers Co., Ltd. was cut into a circle having a diameter of 59.5 mm.
It was 0.0796g when the weight was measured.
Benrise is a continuous long-fiber nonwoven fabric made of 100% cellulose.
It has excellent water absorption characteristics and is a continuous long fiber, so it has sufficient strength when it contains water and has excellent liquid diffusibility.
(廃インク吸収シートの製造)
上記吸水性樹脂粒子(1)、(2)のうちから選択される吸水性樹脂の粒径850〜1200μmの成分を0.164g採り、直径59.5mmのテフロン(登録商標)のシート上に粒子同士が密着しないように配置した。これを第1の吸水性樹脂粒子担持シートとした。
第1の吸水性樹脂粒子担持シートと同様の手法により、第2の吸水性樹脂粒子担持シートを作製した。
第1の吸水性樹脂粒子担持シートの粒子配置面と前記基材面を合致させ、霧吹きを用いて水を3ml散布した。
続いて、第2の吸水性樹脂粒子担持シートの粒子配置面と前記基材面とを合致させる。
これにより、第1の吸水性樹脂粒子担持シート及び第2の吸水性樹脂粒子担持シートは、それぞれ粒子配置面を前記基材の表裏面に合致させた状態となった3層積層体になった。
これを手で軽く抑えた後、1分間放置し、イナートオーブンを用いて180℃で10分間の加熱処理を行った。これにより廃インク吸収シートが作製された。
重量測定を行ったところ0.4061gであった。
廃インク吸収シートの吸水性樹脂の重量比率は、(0.164×2/0.4061)×100=80.4%であった。
また、全吸水性樹脂粒子が基材と強固に接着しており、手でこすっても脱離しないことが確認された。さらに吸水性樹脂粒子の接着状態を走査電子顕微鏡(JEOL製JSM−5300)により観察したとところ、全粒子が繊維を吸水性樹脂中へ取り込む形で接着していることが確認された。
(Manufacture of waste ink absorbing sheet)
0.164 g of a water absorbent resin particle size of 850 to 1200 μm selected from the water absorbent resin particles (1) and (2) is taken, and the particles are placed on a Teflon (registered trademark) sheet having a diameter of 59.5 mm. They were placed so that they were not in close contact with each other. This was used as a first water-absorbing resin particle-carrying sheet.
A second water-absorbing resin particle-carrying sheet was produced in the same manner as the first water-absorbing resin particle-carrying sheet.
The particle arrangement surface of the first water-absorbing resin particle-carrying sheet was matched with the substrate surface, and 3 ml of water was sprayed using a spray.
Subsequently, the particle arrangement surface of the second water absorbent resin particle-carrying sheet is matched with the substrate surface.
As a result, the first water-absorbing resin particle-carrying sheet and the second water-absorbing resin particle-carrying sheet were each a three-layer laminate in which the particle arrangement surface was matched with the front and back surfaces of the substrate. .
After holding it lightly by hand, it was left for 1 minute, and was heated at 180 ° C. for 10 minutes using an inert oven. As a result, a waste ink absorbing sheet was produced.
When the weight was measured, it was 0.4061 g.
The weight ratio of the water-absorbing resin in the waste ink absorbing sheet was (0.164 × 2 / 0.4061) × 100 = 80.4%.
Further, it was confirmed that all the water-absorbing resin particles were firmly adhered to the base material and did not detach even when rubbed by hand. Further, when the adhesion state of the water absorbent resin particles was observed with a scanning electron microscope (JSM-5300 manufactured by JEOL), it was confirmed that all the particles were adhered in such a manner that the fibers were taken into the water absorbent resin.
〔実施例1〕
吸水性樹脂粒子(1)を用いて廃インク吸収シートを作製し特性評価を行った。
インクジェットインク(セイコーエプソン社製、インクカートリッジIC1BK05W)10gを、スポイトを用いて10秒間かけて滴下したところ、インク液がこぼれずに満遍なく吸収された。
[Example 1]
A waste ink absorbing sheet was prepared using the water-absorbing resin particles (1), and the characteristics were evaluated.
When 10 g of inkjet ink (manufactured by Seiko Epson Corporation, ink cartridge IC1BK05W) was dropped over 10 seconds using a dropper, the ink liquid was uniformly absorbed without spilling.
〔実施例2〕
吸水性樹脂粒子(2)を用いて廃インク吸収シートを作製し特性評価を行った。
インクジェットインク(セイコーエプソン社製、インクカートリッジIC1BK05W)10gを、スポイトを用いて10秒間かけて滴下したところ、インク液の一部が吸収しきれずに廃インク吸収シート端部からこぼれた。
滴下時間を10秒間から15秒間に延長したところ、インク液がこぼれずに満遍なく吸収された。
[Example 2]
A waste ink absorbing sheet was prepared using the water absorbent resin particles (2), and the characteristics were evaluated.
When 10 g of inkjet ink (Seiko Epson, ink cartridge IC1BK05W) was dropped over 10 seconds using a dropper, a part of the ink liquid could not be absorbed and spilled from the end of the waste ink absorbing sheet.
When the dropping time was extended from 10 seconds to 15 seconds, the ink liquid was absorbed uniformly without spilling.
上記実施例1、2の廃インク吸収シートは、いずれも実用上十分に良好な吸収特性が得られた。
特に吸水性樹脂の側鎖のカルボン酸基がアンモニウム塩の形で中和されている実施例1の廃インク吸収シートは、より優れた吸水性を発揮できることが分かった。
The waste ink absorbing sheets of Examples 1 and 2 obtained practically sufficiently good absorption characteristics.
In particular, it was found that the waste ink absorbing sheet of Example 1 in which the side chain carboxylic acid groups of the water-absorbing resin were neutralized in the form of ammonium salts can exhibit better water absorption.
本発明の廃インク吸収シートは優れたインク吸収性を有しているので、インクジェット式の記録装置の廃インクタンク内に配置することにより、装置傾斜時や転倒時においても、インクの流出が回避できるという点で、産業上の利用可能性がある。 Since the waste ink absorbing sheet of the present invention has excellent ink absorptivity, it is arranged in the waste ink tank of the ink jet recording apparatus, so that the ink can be prevented from flowing out even when the apparatus is tilted or falls. It has industrial applicability in that it can.
Claims (6)
インクを吐出するノズルと、当該ノズルから回収された廃インクを保持する廃インク収納機構とを具備し、
前記廃インク吸収シートが、前記廃インク収納機構に配置されているインクジェット式記録装置。 An ink jet recording apparatus comprising the waste ink absorbing sheet according to any one of claims 1 to 5,
A nozzle for ejecting ink, and a waste ink storage mechanism for holding waste ink collected from the nozzle,
An ink jet recording apparatus in which the waste ink absorbing sheet is disposed in the waste ink storage mechanism.
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