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JPH0446617B2 - - Google Patents

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Publication number
JPH0446617B2
JPH0446617B2 JP60098782A JP9878285A JPH0446617B2 JP H0446617 B2 JPH0446617 B2 JP H0446617B2 JP 60098782 A JP60098782 A JP 60098782A JP 9878285 A JP9878285 A JP 9878285A JP H0446617 B2 JPH0446617 B2 JP H0446617B2
Authority
JP
Japan
Prior art keywords
water
resin composition
polyvalent metal
polymer particles
metal salt
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.)
Expired - Lifetime
Application number
JP60098782A
Other languages
Japanese (ja)
Other versions
JPS61257235A (en
Inventor
Fusayoshi Masuda
Ryoichi Miki
Satoshi Tate
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Chemical Industries Ltd
Original Assignee
Sanyo Chemical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Chemical Industries Ltd filed Critical Sanyo Chemical Industries Ltd
Priority to JP60098782A priority Critical patent/JPS61257235A/en
Publication of JPS61257235A publication Critical patent/JPS61257235A/en
Publication of JPH0446617B2 publication Critical patent/JPH0446617B2/ja
Granted legal-status Critical Current

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Description

【発明の詳細な説明】[Detailed description of the invention]

〔産業上の利用分野〕 本発明は吸水性樹脂組成物、その製法および吸
水、保水剤に関する。 〔従来の技術〕 近年、生理用品、紙おむつなどに架橋ポリエチ
レンオキシド、架橋ポバール、デンプン−ポリア
クリロニトリルグラフト重合体の加水分解物、自
己架橋型ポリアクリル酸金属塩など比較的高い吸
水能力を有する吸水材料が出現し始めた。しかし
ながら、これら材料は吸水能力を有するものの高
い吸水速度を必要とする生理用品、紙おむつなど
に使用するには十分満足すべきものではなかつ
た。すなわち吸水能力を高めれぽ高めるほど、水
との親和力が強まるため、これらの材料が水と接
触した場合接触部分だけでゲル化を生じ水の均一
な浸透がさまたげられ速やかな吸水速度が得られ
ないという問題(以下ママコという)があつた。 この欠点を改良するため、これらの吸水材料を
微粉化して表面積を増大させ、水との接触面をふ
やすことで吸水速度を高める方法がとられてき
た。この場合、吸水性材料の表面積がふえること
から幾分吸水速度は速くなるが、粒子表面におい
て水の接触部に皮膜を生じ均一な水の浸透が行な
われないため、吸水速度の改良にはつながらなか
つた。 本発明者等は特願昭56−140571号(特開昭58−
42602号)において親和性架橋重合体を分散媒に
分散させた後、さらに架橋剤を該親水性架橋重合
体の表面に架橋させることを提案した。この方法
は吸水材料が水と接触した場合、接触部分だけで
ゲル化することなく、水の均一な浸透を促進する
ため、吸水速度を高めるために有効であるが、こ
の方法によつても吸水速度の改良は、まだ十分満
足できるものではなく、かつ非経済的な方法であ
つた。 一方、特願昭59−181682号(特開昭61−58658
号)においては水不溶性吸水樹脂と無機粒子とを
混合することを提案しているが、この方法は吸水
速度の向上に若干の効果はあるもののとても満足
できるものではなかつた。 〔発明が解決しようとする問題点〕 本発明者らは吸水材料の吸水速度向上のために
は従来の技術によつても十分解決され得ない問題
点すなわちママコの解消を目的として鋭意研究を
重ねた結果、重合体粒子に少量の多価金属の塩お
よび/または水酸化物を混合しさらに少量の水を
添加することにより、被吸収液が重合体粒子間の
付着なしに各重合体粒子間を容易に通過出来るこ
とを発見した。更に添加する水が多価金属塩の水
溶液である場合はその効果が一段と優れることを
発見し本発明に到つた。 〔問題を解決するための手段〕 本発明は親水性および/または水溶性単量体か
らの水不溶性、親水性重合体粒子と多価金属の塩
および/または水酸化物との混合物に、必須成分
として水を付与させてなることを特徴とする改質
された水不溶性吸水性樹脂組成物。 本発明において重合体粒子と混合される多価金
属の塩または水酸化物は、多価金属としてMg,
Ca,Ba,Zn,Feなどの二価金属およびAl,Fe
などの三価金属など;これら金属のハロゲン化
物、硝酸塩、リン酸塩、硫酸塩、炭素塩などの無
機の正塩および複塩または修酸塩、醋酸塩などの
低級有機酸塩など、および水酸化物であり;具体
的な化合物としては塩化カルシウム、塩化マグネ
シウム、塩化第1鉄、塩化アルミニウム、ポリ塩
化アルミニウム、塩化第2鉄、硝酸鉄、硝酸カル
シウム、硝酸アルミニウム、リン酸マグネシウ
ム、リン酸カルシウム、リン酸アルミニウム、硫
酸マグネシウム、硫酸第1鉄、硫酸アルミニウ
ム、硫酸アルミニウムカリウム、硫酸アルミニウ
ムアンモニウム、炭酸カルシウム、炭酸マグネシ
ウム、炭酸マグネシウムカルシウム、修酸マグネ
シウム、修酸カルシウム、醋酸マグネシウム、醋
酸カルシウム、醋酸アルミニウム、水酸化カルシ
ウム、水酸化アルミニウムなどがあげられる。こ
れら化合物は単独であるいは併用して用いても良
い。これらのうち好ましいものは水に難溶性の化
合物であり、特に好ましいものはリン酸カルシウ
ム、リン酸アルミニウム、集散カルシウム、水酸
化カルシウム、水酸化アルミニウムである。 重合体粒子と混合される多価金属の塩および/
または水酸化物の量は通常0.01〜10重量%、好ま
しくは0.1〜5重量%である。0.01重量%未満で
は効果が認められず、また10重量%より大きくし
ても特にその効果の向上は認められなく吸水能力
の低下が起るため好ましくない。 重合体粒子と多価金属の塩および/または水酸
化物との混合は乾式混合により行うが、乾式混合
の装置としては、均一に混合し得るものであれば
とくに限定されず、通常V型混合機、ナウターミ
キサー、ボールミルなどが使用できる。 本発明において使用される水としては水道水、
工業用水、地下水、イオン交換水、純水などがあ
げられる。好ましくは水道水である。 さらに水が重合体成分と反応して三次元構造を
形成させ得る水に可溶な多価金属の塩を含有して
いる方がより優れた吸水速度が得られる。架橋剤
として使用するこの多価金属の塩は、多価金属と
してはMg,Ca,Ba,Zn,Feなどの二価金属お
よびAl,Feなどの三価金属;塩としてはハロゲ
ン化物、硝酸塩、硫酸塩などの無機の正塩および
複塩または醋酸塩、乳酸塩などのうちに水に可溶
な化合物であり;具体的な化合物としては塩化カ
ルシウム、塩化マグネシウム、塩化第1鉄、塩化
アルミニウム、ポリ塩化アルミニウム、塩化第2
鉄、硝酸鉄、硝酸カルシウム、硝酸アルミニウ
ム、硫酸マグネシウム、硫酸第1鉄、硫酸アルミ
ニウム、硫酸アルミニウムカリウム、硫酸アルミ
ニウムアンモニウム、醋酸マグネシウム、醋酸カ
ルシウム、醋酸アルミニウム、乳酸カルシウムな
どがあげられる。これらのうち好ましいものはカ
ルシウム塩、アルミニウム塩であり特に好ましい
塩としては硫酸塩、醋酸塩である。 本発明で使用される親水性および/または水溶
性単量体からの水不溶性、親水性重合体としては
(親水性および/または水溶性単量体)および/
または(加水分解により親水性および/または水
溶性となる単量体)(A)と多糖類(B)との重合体たと
えばデンプン−アクリロニトリルグラフト共重合
体の加水分解物、セルロース−アクリル酸グラフ
ト共重合体およびその塩など;(A)と架橋剤(C)との
重合体たとえばジビニル化合物(メチレンビスア
クリルアミドなど)で架橋されたポリアクリルア
ミドおよびその部分加水分解物、架橋ポハール、
特開昭52−14689号、特開昭52−27455号記載の架
橋されたビニルエステル−不飽和カルボン酸共重
合体ケン化物、架橋ポリエチレンオキシドなど;
(A)と(B)と(C)とを必須成分として重合させ必要によ
り加水分解を行うことにより得られる重合体たと
えば特公昭53−46199号、特公昭53−46200号およ
び特公昭55−4462号記載の架橋されたデンプン−
アクリルアミドグラフト共重合体、架橋されたデ
ンプン−アクリル酸グラフト共重合体およびその
塩などがあげられる。これらの親水性架橋重合体
は二種以上併用してもよい。 重合体粒子の粒度は通常5〜5000μ以下、好ま
しくは20〜500μである。 重合体粒子は通常60ml/g以上の吸水力を有す
るものである。 重合体粒子と多価金属の塩および/または水酸
化物との混合物に対する水の量は通常0.05ないし
50重量%、好ましくは0.5〜10%である。水の量
が0.05%未満では重合体粒子の表面の改質が不十
分であり、50%を越えると加熱処理が必要となる
とともに重合体粒子の表層の密度が高くなり過
ぎ、かえつて吸水速度が低下する。 架橋剤としての水に可溶な多価金属の塩の使用
量は、親水性架橋重合体に対して通常0〜10重量
%、好ましくは0.1〜5重量%であり、10重量%
より大きいと吸水速度の改良はできるものの吸水
能力の低下がいちぢるしくなり、吸水性樹脂とし
て実用上使用し難い。 水または水に可溶な多価金属塩を含む水(以下
断わらない限り水で代表させる)を重合体粒子と
多価金属の塩および/または水酸化物との混合物
に付与する方法としては()水不溶性、親水性
重合粒子と多価金属の塩および/または水酸化物
の混合物に水をスプレーし接触処理を行う方法、
()水蒸気を水不溶性、親和性重合体粒子と多
価金属の塩および/または水酸化物の混合物に接
触させることにより、水蒸気を重合体粒子表面で
水滴となし接触処理を行う方法があげられる。 接触処理における温度は室温でよく特に加熱の
必要はないが、加熱を行つてもよく時間は1〜
120分、好ましくは2〜30分である。 本発明の改良された吸水性樹脂組成物には増量
剤、顔料、紫外線吸収剤、酸化防止剤、防カビ
剤、殺菌剤、除草剤、肥料、香料、消臭剤、還元
剤などを含有させて用いてもよい。とくに還元剤
を本発明の樹脂組成物に含有させた場合は、本発
明においても使用される金属塩が第一塩となり、
この第一塩が脱臭能力を発現するという特徴が加
わる。 例えば還元剤としてはチオ尿素、L−アスコル
ビン酸などが挙げられる。 本発明の水不溶性吸水性樹脂組成物は吸水、保
水剤として使用できる。この吸水、保水剤として
は下記があげられる。 () 吸水性物品用吸水、保水剤 使い捨ておむつ、生理用ナプキン、創傷包
帯、失禁パツト、各種紙および繊維製品用吸水
性向上剤、吸汗性付与剤など、例えば特願昭49
−149090号、特開昭57−82566号等に記述され
ているもの。 () 農林園芸用保水材 土壌保水性向上剤、農薬・肥料用効力持続
剤、水苔代替品、植物移植用保水剤、植物育成
用ポツト用保水剤など、例えば特公昭55−4462
号、特開昭52−82715号、特公昭56−45882号、
特開昭58−31919号等に記述されているもの。 () 建築用吸水材 壁材、天井材等の内装建材用結露防止剤な
ど、例えば特開昭58−65075等に記述されてい
るもの。 () その他 土木および諸工業用脱水剤(メタノール、エ
タノール、ベンジン、石油エーテル、ガソリ
ン、植物油、重油などの液状物の脱水剤など)、
重金属吸着剤、汚泥凝固剤、各種薬剤、香料等
のコントロール・リリース化剤などで、例えば
特公昭58−1624号、特開昭53−7107430等に記
述されているもの。 〔実施例〕 以下、実施例により本発明をさらに説明する
が、本発明はこれに限定されるものではない。 実施例 1〜4 水不溶性、親水性重合体粒子(三洋化成工業社
製サンウエツト1M−1000U;50μ以下の微粒子約
15%含有)100部と水酸化アルミニウム1部をV
型混合機で10分間混合した。この混合物40gを空
気の吹き込み口およびその排気口を備え、かつ水
のスプレーノズルを備えた装置(例えば、ヤマト
科学株式会社製噴霧乾燥装置GA−21)のチヤン
バー(1.8)内に入れ、風量0.2m3/分で空気を
吹き込みながら、混合物に水をそれぞれ0.1%,
1%,5%,10%噴霧し、吸水性樹脂組成物
〔A〕,〔B〕,〔C〕,〔D〕を得た。 実施例 5〜8 実施例1〜4において、水の中に硫酸アルミニ
ウム10%を溶解させ、これをそれぞれ噴霧し、吸
水性樹脂組成物〔E〕,〔F〕,〔G〕,〔H〕を得
た。 実施例 9 実施例1〜8において得られた吸水性樹脂組成
物の0.9%食塩水の吸収量および吸収速度を測定
し、その結果を表−1に示した。なお吸収量の測
定法は200メツシユのナイロン製不織布を袋状に
し、これに樹脂組成物1gを封入して、30分間
0.9%食塩水に浸漬した後、取り出して15分間水
切りを行つた後増加重量を測定した。また吸収速
度については小穴のあいた支持板の上に200メツ
シユのナイロン製不織布を置く。この上に0.1g
の樹脂組成物を置き、下面より液体と接触させ2
分間で樹脂組成物が0.9%食塩水を吸収する量を
測定し、樹脂組成物1g当りの吸収量に換算し
た。 比較例 1〜3 比較例 1 サンウエツト1M−1000U無処理品。 比較例 2 実施例1においてサンウエツト1M−1000Uに
水酸化アルミニウムを混合することによつて吸収
性樹脂組成物〔J〕を得た。 比較例 3 実施例3においてサンウエツト1M−1000Uに
水酸化アルミニウムを混合することなく水のみを
噴霧することによつて吸収性樹脂組成物〔K〕を
得た。
[Industrial Application Field] The present invention relates to a water-absorbing resin composition, its production method, and water-absorbing and water-retaining agents. [Prior art] In recent years, water-absorbing materials with relatively high water-absorbing capacity, such as cross-linked polyethylene oxide, cross-linked POVAL, starch-polyacrylonitrile graft polymer hydrolysates, and self-cross-linked polyacrylic acid metal salts, have been used in sanitary products, disposable diapers, etc. began to appear. However, although these materials have water absorption capacity, they are not sufficiently satisfactory for use in sanitary products, disposable diapers, etc., which require a high water absorption rate. In other words, the higher the water absorption capacity, the stronger the affinity with water, so when these materials come into contact with water, gelation occurs only in the contact area, which prevents the uniform penetration of water and prevents a rapid water absorption rate. I had a problem (hereinafter referred to as Mamako). In order to improve this drawback, methods have been used to increase the rate of water absorption by pulverizing these water-absorbing materials to increase their surface area and increasing the contact surface with water. In this case, the surface area of the water-absorbing material increases, so the water absorption rate becomes somewhat faster, but because a film forms on the surface of the particles where water comes into contact, and water does not permeate uniformly, the water absorption rate does not improve. Nakatsuta. The inventors of the present invention have filed Japanese Patent Application No. 56-140571
No. 42602) proposed dispersing an affinity crosslinked polymer in a dispersion medium and then further crosslinking the surface of the hydrophilic crosslinked polymer with a crosslinking agent. This method is effective for increasing the water absorption rate because when the water-absorbing material comes into contact with water, it promotes the uniform penetration of water without gelling only in the contact area. Speed improvements have not yet been fully satisfactory and have been uneconomical. On the other hand, Japanese Patent Application No. 59-181682 (Japanese Patent Application No. 61-58658)
No. 1) proposed mixing a water-insoluble water-absorbing resin with inorganic particles, but although this method was somewhat effective in improving the water absorption rate, it was not very satisfactory. [Problems to be Solved by the Invention] In order to improve the water absorption rate of water-absorbing materials, the present inventors have conducted extensive research with the aim of solving a problem that cannot be sufficiently solved even with conventional technology, that is, bulges. As a result, by mixing a small amount of polyvalent metal salt and/or hydroxide with polymer particles and adding a small amount of water, the absorbed liquid can be distributed between each polymer particle without adhesion between the polymer particles. I discovered that it is possible to pass through easily. Furthermore, it was discovered that the effect is even more excellent when the water added is an aqueous solution of a polyvalent metal salt, leading to the present invention. [Means for Solving the Problem] The present invention provides a mixture of water-insoluble, hydrophilic polymer particles made from hydrophilic and/or water-soluble monomers with salts and/or hydroxides of polyvalent metals. A modified water-insoluble water-absorbing resin composition, characterized in that it contains water as a component. In the present invention, the polyvalent metal salts or hydroxides mixed with the polymer particles include Mg,
Divalent metals such as Ca, Ba, Zn, Fe and Al, Fe
Trivalent metals such as halides, nitrates, phosphates, sulfates, carbonates, and other inorganic normal salts and double salts or oxalates, acetates and other lower organic salts, etc.; It is an oxide; specific compounds include calcium chloride, magnesium chloride, ferrous chloride, aluminum chloride, polyaluminum chloride, ferric chloride, iron nitrate, calcium nitrate, aluminum nitrate, magnesium phosphate, calcium phosphate, phosphorus. Aluminum acid, magnesium sulfate, ferrous sulfate, aluminum sulfate, potassium aluminum sulfate, ammonium aluminum sulfate, calcium carbonate, magnesium carbonate, calcium magnesium carbonate, magnesium oxalate, calcium oxalate, magnesium acetate, calcium acetate, aluminum acetate, water Examples include calcium oxide and aluminum hydroxide. These compounds may be used alone or in combination. Among these, preferred are compounds that are sparingly soluble in water, and particularly preferred are calcium phosphate, aluminum phosphate, dispersed calcium, calcium hydroxide, and aluminum hydroxide. Polyvalent metal salts and/or mixed with polymer particles
Alternatively, the amount of hydroxide is usually 0.01 to 10% by weight, preferably 0.1 to 5% by weight. If it is less than 0.01% by weight, no effect will be observed, and if it is greater than 10% by weight, no particular improvement in the effect will be observed and the water absorption capacity will decrease, which is not preferable. The polymer particles and the polyvalent metal salt and/or hydroxide are mixed by dry mixing, but the dry mixing device is not particularly limited as long as it can mix uniformly, and is usually a V-type mixing device. Machines, Nauta mixers, ball mills, etc. can be used. The water used in the present invention includes tap water,
Examples include industrial water, groundwater, ion exchange water, and pure water. Preferably it is tap water. Furthermore, a better water absorption rate can be obtained by containing a water-soluble polyvalent metal salt that can react with the polymer component to form a three-dimensional structure. The polyvalent metal salts used as crosslinking agents include divalent metals such as Mg, Ca, Ba, Zn, and Fe, and trivalent metals such as Al and Fe; salts include halides, nitrates, It is a water-soluble compound among inorganic normal salts and double salts such as sulfates, acetates, lactates, etc.; specific compounds include calcium chloride, magnesium chloride, ferrous chloride, aluminum chloride, Polyaluminum chloride, dichloride
Examples include iron, iron nitrate, calcium nitrate, aluminum nitrate, magnesium sulfate, ferrous sulfate, aluminum sulfate, potassium aluminum sulfate, ammonium aluminum sulfate, magnesium acetate, calcium acetate, aluminum acetate, calcium lactate, and the like. Among these, preferred are calcium salts and aluminum salts, and particularly preferred are sulfates and acetates. Water-insoluble, hydrophilic polymers from hydrophilic and/or water-soluble monomers used in the present invention include (hydrophilic and/or water-soluble monomers) and/or
or a polymer of (a monomer that becomes hydrophilic and/or water-soluble upon hydrolysis) (A) and a polysaccharide (B), such as a hydrolyzate of a starch-acrylonitrile graft copolymer, a cellulose-acrylic acid graft copolymer; Polymers and salts thereof; polymers of (A) and crosslinking agent (C), such as polyacrylamide crosslinked with a divinyl compound (methylenebisacrylamide, etc.) and its partial hydrolyzate, crosslinked pohar,
Crosslinked vinyl ester-unsaturated carboxylic acid copolymer saponified products, crosslinked polyethylene oxide, etc. described in JP-A-52-14689 and JP-A-52-27455;
Polymers obtained by polymerizing (A), (B), and (C) as essential components and hydrolyzing if necessary, such as Japanese Patent Publication No. 53-46199, Japanese Patent Publication No. 53-46200, and Japanese Patent Publication No. 55-4462. Cross-linked starch described in No.
Examples include acrylamide graft copolymers, crosslinked starch-acrylic acid graft copolymers, and salts thereof. Two or more of these hydrophilic crosslinked polymers may be used in combination. The particle size of the polymer particles is usually 5 to 5000 microns or less, preferably 20 to 500 microns. The polymer particles usually have a water absorption capacity of 60 ml/g or more. The amount of water relative to the mixture of polymer particles and polyvalent metal salt and/or hydroxide is usually from 0.05 to
50% by weight, preferably 0.5-10%. If the amount of water is less than 0.05%, the surface modification of the polymer particles will be insufficient, and if it exceeds 50%, heat treatment will be required and the density of the surface layer of the polymer particles will become too high, which will actually reduce the water absorption rate. decreases. The amount of water-soluble polyvalent metal salt used as a crosslinking agent is usually 0 to 10% by weight, preferably 0.1 to 5% by weight, and 10% by weight based on the hydrophilic crosslinked polymer.
If it is larger, the water absorption rate can be improved, but the water absorption capacity will be significantly reduced, making it difficult to use it practically as a water absorbent resin. As a method for applying water or water containing a polyvalent metal salt soluble in water (represented by water unless otherwise specified) to a mixture of polymer particles and a polyvalent metal salt and/or hydroxide, ( ) A method of contact treatment by spraying water onto a mixture of water-insoluble, hydrophilic polymer particles and a polyvalent metal salt and/or hydroxide;
() A method of contact treatment in which water vapor is brought into contact with a mixture of water-insoluble, affinity polymer particles and a polyvalent metal salt and/or hydroxide to form water droplets on the surface of the polymer particles. . The temperature in the contact treatment may be room temperature, and there is no particular need for heating, but heating may be performed and the time may be between 1 and 2.
120 minutes, preferably 2 to 30 minutes. The improved water-absorbent resin composition of the present invention may contain fillers, pigments, ultraviolet absorbers, antioxidants, fungicides, fungicides, herbicides, fertilizers, fragrances, deodorants, reducing agents, etc. It may also be used. In particular, when a reducing agent is contained in the resin composition of the present invention, the metal salt used also in the present invention becomes the primary salt,
An additional feature is that this primary salt exhibits deodorizing ability. For example, examples of the reducing agent include thiourea and L-ascorbic acid. The water-insoluble water-absorbing resin composition of the present invention can be used as a water-absorbing and water-retaining agent. The water absorbing and water retaining agents include the following. () Water absorption and water retention agents for water-absorbent articles Disposable diapers, sanitary napkins, wound dressings, incontinence pads, water absorption improvers and sweat absorption agents for various paper and textile products, etc., for example, patent application filed in 1973.
-149090, JP-A No. 57-82566, etc. () Water retention materials for agriculture, forestry and horticulture Soil water retention improvers, efficacy sustaining agents for agricultural chemicals and fertilizers, sphagnum moss substitutes, water retention agents for plant transplants, water retention agents for pots for growing plants, etc. For example, Japanese Patent Publication No. 55-4462
No., JP-A-52-82715, JP-A-56-45882,
What is described in JP-A No. 58-31919, etc. () Water-absorbing materials for construction Anti-condensation agents for interior construction materials such as wall materials and ceiling materials, such as those described in JP-A No. 58-65075. () Others Dehydrating agents for civil engineering and various industries (dehydrating agents for liquids such as methanol, ethanol, benzine, petroleum ether, gasoline, vegetable oil, heavy oil, etc.),
Heavy metal adsorbents, sludge coagulants, various drugs, agents for controlling and releasing fragrances, etc., such as those described in Japanese Patent Publication No. 58-1624, Japanese Patent Application Laid-open No. 53-7107430, etc. [Example] The present invention will be further described below with reference to Examples, but the present invention is not limited thereto. Examples 1 to 4 Water-insoluble, hydrophilic polymer particles (Sunwet 1M-1000U manufactured by Sanyo Chemical Industries, Ltd.; fine particles of approximately 50μ or less
100 parts of aluminum hydroxide (containing 15%) and 1 part of aluminum hydroxide
Mixed in a mold mixer for 10 minutes. 40 g of this mixture was placed in the chamber (1.8) of a device equipped with an air inlet and an air outlet, and a water spray nozzle (for example, the spray dryer GA-21 manufactured by Yamato Scientific Co., Ltd.), and the air volume was 0.2. Add 0.1% water and 0.1% water to the mixture while blowing air at m 3 /min.
1%, 5%, and 10% were sprayed to obtain water absorbent resin compositions [A], [B], [C], and [D]. Examples 5 to 8 In Examples 1 to 4, 10% aluminum sulfate was dissolved in water and sprayed to prepare water absorbent resin compositions [E], [F], [G], and [H]. I got it. Example 9 The absorption amount and absorption rate of 0.9% saline solution of the water absorbent resin compositions obtained in Examples 1 to 8 were measured, and the results are shown in Table 1. The absorption amount was measured by forming a 200-mesh nylon nonwoven fabric into a bag, enclosing 1 g of the resin composition in it, and leaving it for 30 minutes.
After being immersed in 0.9% saline, it was taken out and drained for 15 minutes, and then the increased weight was measured. Regarding the absorption rate, a 200 mesh nylon non-woven fabric was placed on a support plate with small holes. 0.1g on top of this
Place the resin composition and bring it into contact with the liquid from the bottom 2.
The amount of 0.9% saline absorbed by the resin composition in minutes was measured and converted into the amount absorbed per 1 g of the resin composition. Comparative Examples 1 to 3 Comparative Examples 1 Sunwet 1M-1000U untreated product. Comparative Example 2 Absorbent resin composition [J] was obtained by mixing aluminum hydroxide with Sunwet 1M-1000U in Example 1. Comparative Example 3 Absorbent resin composition [K] was obtained by spraying only water to Sunwet 1M-1000U in Example 3 without mixing aluminum hydroxide.

【表】 実施例 10〜13 実施例5〜8において、スプレーノズルを備え
た装置のチヤンバー内の空気および吹込み用空気
を80℃に設定して、硫酸アルミニウム(純分換
算)10%水溶性を所定量噴霧し、更に5分間チヤ
ンバー内に帯留させて、吸水性樹脂組成物〔I〕、
〔J〕、〔K〕、〔L〕を得た。 得られた吸水性樹脂組成物の吸収量および吸収
速度を実施例9に従つて測定した結果は以下の通
りである。
[Table] Examples 10 to 13 In Examples 5 to 8, the air in the chamber of the device equipped with the spray nozzle and the blowing air were set at 80°C, and aluminum sulfate (purity equivalent) 10% water-soluble A predetermined amount of the water-absorbing resin composition [I]
[J], [K], and [L] were obtained. The absorption amount and absorption rate of the obtained water absorbent resin composition were measured according to Example 9, and the results are as follows.

〔発明の効果〕〔Effect of the invention〕

本発明の吸水性樹脂組成物およびこれを含有す
る吸水、保水剤は水の均一な浸透性を促進し著し
く高い吸水速度を有する吸水性樹脂組成物であ
る。本発明による製品の特徴は、前述の吸水速度
の向上のほか、湿度に対する安定性、すなわち本
発明の吸水性樹脂組成物を高湿度下に放置して
も、樹脂の粒子同志がブロツキング現像を起しに
くいという特長、経日安定性、すなわち長期にわ
たる使用中の保水性、保形性維持の点でも優れて
いる。更に粉体取扱い時の発塵発生が少ないとい
う特長を有する。
The water-absorbing resin composition of the present invention and the water-absorbing and water-retaining agent containing the same are water-absorbing resin compositions that promote uniform permeability of water and have an extremely high water absorption rate. In addition to the above-mentioned improvement in the water absorption rate, the product of the present invention is characterized by its stability against humidity, that is, even when the water-absorbing resin composition of the present invention is left under high humidity, the resin particles do not cause blocking development among themselves. It is also excellent in terms of being difficult to peel, and stability over time, that is, maintaining water retention and shape retention during long-term use. Furthermore, it has the advantage of generating less dust when handling powder.

Claims (1)

【特許請求の範囲】 1 親水性および/または水溶性単量体からの水
不溶性、親水性重合体粒子と多価金属の塩およ
び/または水酸化物との混合物に、必須成分とし
て水を付与させてなることを特徴とする改質され
た水不溶性吸水性樹脂組成物。 2 多価金属の塩および/または水酸化物の量が
該重合体成分に対して0.01〜10重量%である特許
請求の範囲第1項記載の吸水性樹脂組成物。 3 水か、該重合体成分と反応して三次元構造を
形成させ得る水に可溶な多価金属の塩を含んでい
る特許請求の範囲第1項または第2項記載の吸水
性樹脂組成物。
[Claims] 1. Adding water as an essential component to a mixture of water-insoluble, hydrophilic polymer particles made from hydrophilic and/or water-soluble monomers and polyvalent metal salts and/or hydroxides. A modified water-insoluble water-absorbing resin composition characterized by: 2. The water-absorbing resin composition according to claim 1, wherein the amount of the polyvalent metal salt and/or hydroxide is 0.01 to 10% by weight based on the polymer component. 3. The water-absorbing resin composition according to claim 1 or 2, which contains water or a water-soluble polyvalent metal salt capable of reacting with the polymer component to form a three-dimensional structure. thing.
JP60098782A 1985-05-08 1985-05-08 Water absorbent resin composition, its preparation and water absorbent-water retention agent Granted JPS61257235A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60098782A JPS61257235A (en) 1985-05-08 1985-05-08 Water absorbent resin composition, its preparation and water absorbent-water retention agent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60098782A JPS61257235A (en) 1985-05-08 1985-05-08 Water absorbent resin composition, its preparation and water absorbent-water retention agent

Publications (2)

Publication Number Publication Date
JPS61257235A JPS61257235A (en) 1986-11-14
JPH0446617B2 true JPH0446617B2 (en) 1992-07-30

Family

ID=14228935

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Country Link
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