JPS63304061A - Production of water-absorbing polymer composition - Google Patents
Production of water-absorbing polymer compositionInfo
- Publication number
- JPS63304061A JPS63304061A JP14030387A JP14030387A JPS63304061A JP S63304061 A JPS63304061 A JP S63304061A JP 14030387 A JP14030387 A JP 14030387A JP 14030387 A JP14030387 A JP 14030387A JP S63304061 A JPS63304061 A JP S63304061A
- Authority
- JP
- Japan
- Prior art keywords
- water
- absorbing resin
- starch
- weight
- absorbing
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 229920000642 polymer Polymers 0.000 title abstract description 7
- 239000000203 mixture Substances 0.000 title description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229920002472 Starch Polymers 0.000 claims abstract description 14
- 239000005060 rubber Substances 0.000 claims abstract description 14
- 239000008107 starch Substances 0.000 claims abstract description 14
- 235000019698 starch Nutrition 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 11
- 229920002725 thermoplastic elastomer Polymers 0.000 claims abstract description 9
- 238000004898 kneading Methods 0.000 claims abstract description 4
- 229920005989 resin Polymers 0.000 claims description 58
- 239000011347 resin Substances 0.000 claims description 58
- 239000011342 resin composition Substances 0.000 claims description 21
- 229920005992 thermoplastic resin Polymers 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 abstract description 14
- -1 alkali metal salt Chemical class 0.000 abstract description 11
- 229920000578 graft copolymer Polymers 0.000 abstract description 11
- 229910052783 alkali metal Inorganic materials 0.000 abstract description 8
- 239000005038 ethylene vinyl acetate Substances 0.000 abstract description 6
- 229920001971 elastomer Polymers 0.000 abstract description 5
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 abstract description 5
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 239000005062 Polybutadiene Substances 0.000 abstract description 2
- 229920002857 polybutadiene Polymers 0.000 abstract description 2
- 229920001169 thermoplastic Polymers 0.000 abstract 2
- 239000002250 absorbent Substances 0.000 description 17
- 230000002745 absorbent Effects 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 10
- 230000014759 maintenance of location Effects 0.000 description 8
- 229920001577 copolymer Polymers 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000010298 pulverizing process Methods 0.000 description 4
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920002125 Sokalan® Polymers 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010413 gardening Methods 0.000 description 2
- 239000004584 polyacrylic acid Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- KUDUQBURMYMBIJ-UHFFFAOYSA-N 2-prop-2-enoyloxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC(=O)C=C KUDUQBURMYMBIJ-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229920001612 Hydroxyethyl starch Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- NPERTKSDHFSDLC-UHFFFAOYSA-N ethenol;prop-2-enoic acid Chemical compound OC=C.OC(=O)C=C NPERTKSDHFSDLC-UHFFFAOYSA-N 0.000 description 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000003898 horticulture Methods 0.000 description 1
- 229940050526 hydroxyethylstarch Drugs 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 description 1
- 239000001254 oxidized starch Substances 0.000 description 1
- 235000013808 oxidized starch Nutrition 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000009512 pharmaceutical packaging Methods 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、吸水性樹脂組成物の製造方法罠関し、さらに
詳しくは、成形加工性を有し、かつ、吸水後の吸水性樹
脂の保持性に優れ高吸水性を有する吸水性樹脂組成物の
製造方法に関する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for producing a water-absorbing resin composition, and more specifically, to a method for producing a water-absorbing resin composition that has moldability and that retains the water-absorbing resin after water absorption. The present invention relates to a method for producing a water-absorbing resin composition having excellent properties and high water absorption.
現在、吸水性樹脂は、紙おむつ、生理用品等の衛生材料
用吸収剤、農園芸用保水剤、その他工業資材等として、
例えば、デンプン−アクリル酸グラフト共重合体アルカ
リ金属塩、デンプン−アクリロニトリルグラフト共重合
体ケン化物、デンプン−アクリルアミドグラフト共重合
体ケン化物等のデンプン系、カルボキシメチルセルロー
ス、セルロース−アクリロニトリルグラフト共重合体ケ
ン化物、七ルロースーアクリル酸グラフト共重合体アル
カリ金属塩等のセルロース系、ポリアクリル酸アルカリ
金属塩等のポリアクリル酸系、ビニルアルコール−アク
リル酸共重合体アルカリ金属塩、ビニルアルコール−無
水マレイン酸共重合体等のポリビニルアルコール系等の
多種のものが用いられている。Currently, water-absorbent resins are used as absorbents for sanitary materials such as disposable diapers and sanitary products, water retention agents for agriculture and horticulture, and other industrial materials.
For example, starch-based products such as alkali metal salts of starch-acrylic acid graft copolymers, saponified starch-acrylonitrile graft copolymers, and saponified starch-acrylonitrile graft copolymers, carboxymethyl cellulose, and saponified cellulose-acrylonitrile graft copolymers. , cellulose-based such as heptalulose-acrylic acid graft copolymer alkali metal salt, polyacrylic acid-based such as polyacrylic acid alkali metal salt, vinyl alcohol-acrylic acid copolymer alkali metal salt, vinyl alcohol-maleic anhydride copolymer Various types of polymers such as polyvinyl alcohol are used.
これらは、いずれの樹脂においても、吸水後の形態保持
性を得るために架橋体となっておし、粉末状である。All of these resins are crosslinked and powdered in order to maintain their shape after water absorption.
さらに、近年、吸水性樹脂の使用用途は拡大の−途をた
どっており、使用形態も粉末状だけでなく、フィルム、
シート、繊維等の形態での吸水性樹脂の要望が大きい。Furthermore, in recent years, the uses of water-absorbing resins have been expanding, and the forms of use are not only powder, but also films,
There is a strong demand for water absorbent resins in the form of sheets, fibers, etc.
しかし、現行の吸水性樹脂は、架橋体でろるところから
熱可塑性がなく、フィルム、シート、繊維等への加工が
著しく国難である。However, current water-absorbing resins are crosslinked and have no thermoplasticity, making it extremely difficult to process them into films, sheets, fibers, etc.
一方、現行の吸水性樹脂にフィルム、繊維等成形加工性
を賦与すべく、例えば、特開昭５１−７５７４７号、同
５６−３３０３２号、同５７−１４５１５１号各公報に
示てれるように、ポリエチレン、エチレン−酢酸ビニル
共ｉ１１体、エチレン−アクリル酸共重合体、エデレン
ープロピレン共重合体等の熱可塑性樹脂またはゴムと吸
水性樹脂との組合物として用いることが知られているが
、該組成物は、意図する成形加工性は有するものの、吸
水後における吸水性樹脂の脱離が著しいという問題があ
る。On the other hand, in order to provide the current water-absorbing resin with moldability for films, fibers, etc., for example, as shown in Japanese Patent Application Laid-open No. 51-75747, No. 56-33032, and No. 57-145151, It is known to be used as a combination of thermoplastic resins or rubber and water absorbent resins such as polyethylene, ethylene-vinyl acetate co-i11, ethylene-acrylic acid copolymer, edelene-propylene copolymer, etc. Although this composition has the intended moldability, there is a problem in that the water-absorbing resin is significantly detached after water absorption.
本発明者等は、吸水性樹脂に成形加工性を賦与すること
を意図した吸水性樹脂と熱可塑性樹脂またはゴムとの組
成物を製造するにおいて、吸水性樹脂として加熱処理さ
れたデンプン系吸水性樹脂微粉末を用いれば、吸水後に
おける吸水性樹脂の脱離がなくその保持性に優れる組成
物が得られることを見出し、本発明に到達したものであ
り、従って、本発明は、成形加工性を有し、かつ、吸水
後の吸水性樹脂の保持性に優れ高吸水性を有する吸水性
樹脂組成物の製造方法を提供することを目的とする。In producing a composition of a water-absorbing resin and a thermoplastic resin or rubber, which is intended to impart moldability to the water-absorbing resin, the present inventors used a heat-treated starch-based water-absorbing resin as a water-absorbing resin. The present invention was achieved by discovering that by using fine resin powder, a composition that does not desorb the water-absorbing resin after water absorption and has excellent retention properties can be obtained. It is an object of the present invention to provide a method for producing a water-absorbing resin composition which has a high water-absorbing property and excellent water-absorbing resin retention after water absorption.
本発明の吸水性樹脂組成物の製造方法は、吸水性樹脂５
〜９５重量シと熱可塑性樹脂またはゴム９５〜５重量％
とを溶融混練して吸水性樹脂組成物を製造するにおいて
、前記吸水性樹脂として、５０メツシュ篩を通過する粉
末であって、１００℃以上の温度で２重量％以下の含水
量に加熱処理されたデンプン系吸水性樹脂を用いること
を特徴とする。The method for producing a water-absorbing resin composition of the present invention includes water-absorbing resin 5
~95% by weight and 95% to 5% by weight of thermoplastic resin or rubber
In producing a water-absorbing resin composition by melt-kneading the water-absorbing resin, the water-absorbing resin is a powder that passes through a 50-mesh sieve and is heat-treated at a temperature of 100° C. or higher to have a water content of 2% by weight or less. It is characterized by using a starch-based water-absorbing resin.
本発明におけるデンプン系吸水性樹脂とは、デンプンお
よびその誘導体（酸化デンプン、ヒドロキシエチルデン
プン等）をペースとする吸水性樹脂であって、具体的に
は、例えば、デンプン−（メタ）アクリル酸グラフト共
重合体アルカリ金属塩、デンプン−（メタ）アクリル酸
エステルグラフト共重合体加水分解物、デンプン−（メ
タ）アクリｏ 二）リルグラフト共重合体ケン化物、デ
ンプン−（メタ）アクリルアミドグラフト共重合体ケン
化物等が挙げられ、これらは架橋しているのが望ましい
。架橋構造は、ジビニルないレジアクリル化合物、特に
水溶性ノモノ、側光ばＮ、Ｎ’−メチレンビスアクリル
アミド、エチレングリコールビスアクリレート、その他
を共重合式せることによって導入することができる。The starch-based water-absorbing resin in the present invention is a water-absorbing resin based on starch and its derivatives (oxidized starch, hydroxyethyl starch, etc.), and specifically, for example, starch-(meth)acrylic acid graft Copolymer alkali metal salt, starch-(meth)acrylic acid ester graft copolymer hydrolyzate, starch-(meth)acrylic acid ester graft copolymer saponified product, starch-(meth)acrylamide graft copolymer saponified product These compounds are preferably crosslinked. The crosslinked structure can be introduced by copolymerizing divinyl-free resin acrylic compounds, especially water-soluble compounds such as N,N'-methylene bisacrylamide, ethylene glycol bisacrylate, and others.
なお、これら吸水性樹脂は、例えば特開昭５３−１３０
７８８号公報等に示されている。Note that these water-absorbing resins are disclosed in, for example, Japanese Patent Application Laid-Open No. 53-130.
This is shown in Publication No. 788, etc.
本発明において、デンプン系吸水性樹脂は、５０メツシ
ュ篩を通過する、好ましくは１００メツシュ篩を通過す
る粉末でろって、１００℃以上、好ましくは１５０℃以
上の温度で、２重量％以下、好ましくは１重粘Ｆ％以下
の含水量に加熱処理されている必要が口妙、これらの要
件のいずれかを満足しないデンプン系吸水性樹脂の場合
には、得られる組成物が、吸水後における１及水性樹脂
の脱離の多いものとなる。In the present invention, the starch-based water-absorbing resin is a powder that passes through a 50-mesh sieve, preferably a 100-mesh sieve, at a temperature of 100°C or higher, preferably 150°C or higher, at a temperature of 2% by weight or less, preferably 2% by weight or less. The starch-based water-absorbing resin must be heat-treated to have a water content of 1% or less after water absorption. This results in a lot of desorption of hydrophilic resin.
なお、デンプン系吸水性樹脂の製造は、前述した４？開
昭５３−１３０７８８号公報にもあるように、水存在下
での共重合後、１００℃未満の温度で含水量が約５〜１
０重量％になる迄乾燥し、その後、１０〜３０メツシュ
篩を通過する程度に粉砕することによりなされており、
従って、本発明における前述の要件を満足する吸水性樹
脂は、例えば、そのデンプン系吸水性樹脂を、５０メツ
シュ篩を通過するように公知の機械粉砕法、化学粉砕法
等で微粉末化し、１００℃以上の温度で含水量が２重量
％以下になるように加熱処理することにより得られる。In addition, the production of starch-based water-absorbing resin is as described in 4. As stated in JP-A-53-130788, after copolymerization in the presence of water, the water content is about 5 to 1 at a temperature of less than 100°C.
It is dried until it becomes 0% by weight, and then pulverized to the extent that it passes through a 10 to 30 mesh sieve.
Therefore, the water-absorbing resin that satisfies the above-mentioned requirements of the present invention can be obtained by, for example, pulverizing the starch-based water-absorbing resin by a known mechanical pulverization method, chemical pulverization method, etc. so that it passes through a 50-mesh sieve, and It is obtained by heat treatment at a temperature of 0.degree. C. or higher so that the water content becomes 2% by weight or less.
また、本発明において用いることができる熱可塑性樹脂
またはゴムとしては、時に制限はないが、例えば、ポリ
エチレン、エチレン−酢酸ビニル共重合体、エチレン−
アクリル酸共重合体、エチレン−プロピレン共重合体、
ポリプロピレン等のポリオレフィン、ポリスチレン、ポ
リアミド、ポリ塩化ビニル等の熱可塑性樹脂、また、エ
チレン−プロピレン共重合体、スチレン−ブタジェン共
重合体、ポリブタジェン、ポリイソプレン等のゴムが挙
げられる。In addition, the thermoplastic resin or rubber that can be used in the present invention is not limited in some cases, but includes, for example, polyethylene, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer,
Acrylic acid copolymer, ethylene-propylene copolymer,
Examples include polyolefins such as polypropylene, thermoplastic resins such as polystyrene, polyamide, and polyvinyl chloride, and rubbers such as ethylene-propylene copolymers, styrene-butadiene copolymers, polybutadiene, and polyisoprene.
本発明において、吸水性樹脂と熱可塑性樹脂またはゴム
の配合割合は、前者吸水性樹脂が５〜９５重蕾％、好ま
しくは２０〜８０重量％、後者樹脂またはゴムが９５〜
５重量％電食ましくは８０〜２０重量％である。前者吸
水性樹脂が５＠螢％未満では吸水性能が低くて、この組
成物を吸水性を有する材料として用いる優位性がなくな
る。一方、９５重＠％を越えると成形加工性が悪化する
。In the present invention, the blending ratio of the water-absorbing resin and the thermoplastic resin or rubber is such that the former water-absorbing resin is 5 to 95% by weight, preferably 20 to 80% by weight, and the latter resin or rubber is 95 to 95% by weight.
5% by weight electrolytic corrosion or 80-20% by weight. If the former water-absorbing resin is less than 5@firefly%, the water-absorbing performance is low, and the advantage of using this composition as a material having water-absorbing properties is lost. On the other hand, if it exceeds 95% by weight, moldability deteriorates.
両者の配合割合は、この範囲内で使用用途に応じて適宜
設定できるが、一般に、吸水性能を重視する用途には吸
水性樹脂の割合を多く、一方、成形性を重視する用途に
は熱可塑性樹脂またはゴムの割合を多くすることが好ま
しい。The blending ratio of both can be set as appropriate depending on the intended use within this range, but in general, for applications where water absorption performance is emphasized, the ratio of water absorbent resin is high, while for applications where moldability is important, thermoplastic resin is used. It is preferable to increase the proportion of resin or rubber.
吸水性樹脂と熱可塑性樹脂またはゴムとの組成物は、必
要に応じて、石油樹脂、ワックス、安定剤、帯電防止剤
、紫外線吸収剤、滑剤、無機充填剤等を添加して、慣用
の混線機、例えば、ロール、バンバリーミキサ−１ブラ
ペンｆ−７’ラストグラフ、ＣＩＭ、ＦＣＭ等の二軸混
練機、−軸押出機等を用いて、熱可塑性樹脂またはゴム
の↓独点または軟化点以上の温度で溶１独混線すること
により製造される。The composition of water-absorbing resin and thermoplastic resin or rubber may be prepared by adding petroleum resin, wax, stabilizer, antistatic agent, ultraviolet absorber, lubricant, inorganic filler, etc. as necessary. Using a machine, for example, a twin-screw kneader such as a roll, Banbury mixer-1 Brapen f-7' last graph, CIM, FCM, -screw extruder, etc., the ↓ unique point or softening point or higher of the thermoplastic resin or rubber It is produced by mixing the melt at a temperature of .
本発明の製造方法により得られる吸水性樹脂組成物は、
成形加工され、単独のフィルム、シート、その曲成形品
として、ま念、他材料との積層フィルム、シート、その
他成形品として、或は繊維として織成する等して、食品
包装用、薬品包装用、長園芸用、結露防止、内装等の建
材用、上水等の土木用、衛生用品用、油水分離用、帯電
防止用等の分野への応用が可能である。The water absorbent resin composition obtained by the production method of the present invention is
Molded and processed as individual films, sheets, curved molded products, laminated films with other materials, sheets, other molded products, or woven as fibers for food packaging, drug packaging, etc. It can be applied to fields such as gardening, long-term gardening, dew condensation prevention, building materials such as interior decoration, civil engineering applications such as water supply, sanitary products, oil/water separation, and antistatic applications.
本発明の吸水性樹脂組成物の製造方法は、成形加工性を
有するのみならず、吸水性樹脂として特定温度で特定の
含水量に加熱処理されたデンプン系吸水性樹脂の微粉末
を用いるので、吸水後の吸水性樹脂の保持性に優れ高吸
水性を有する吸水性樹脂組成物を製造することができる
ものである。The method for producing a water-absorbing resin composition of the present invention not only has moldability but also uses fine powder of a starch-based water-absorbing resin that has been heat-treated to a specific water content at a specific temperature as the water-absorbing resin. It is possible to produce a water-absorbing resin composition that has excellent water-absorbing resin retention properties after water absorption and has high water-absorbing properties.
以下の実施例、比較例において、吸水率、吸水性樹脂保
持率は次の測定法によった。In the following Examples and Comparative Examples, the water absorption rate and water absorbent resin retention rate were determined by the following measuring method.
玉ｊ」Ｌ
１リツトルのビーカーに吸水性樹脂組成物の試験片約１
２及び純水約１リツトルをそれぞれ秤量して入れ、２５
℃で２４時間放置して十分に膨潤させる。次いで、８メ
ツシュ篩で水切りをし、試験片表面に付着している水を
Ｆ紙で堰り除いたのち、試験片を秤量する。吸水率の算
出は、下記式を用いて行なう。Approximately 1 test piece of water absorbent resin composition in a 1 liter beaker
Weigh out 2 and about 1 liter of pure water and add 25
Leave at ℃ for 24 hours to allow sufficient swelling. Next, drain the water through an 8-mesh sieve, remove water adhering to the surface of the test piece with F paper, and then weigh the test piece. The water absorption rate is calculated using the following formula.
吸水性樹脂保持率
吸水率測定に用いた試験片を１００Ｃで２４時間真空乾
燥処理を行なった後、デシケータ−中で室温になるまで
放置し、秤量する。The test piece used to measure water absorbent resin retention and water absorption was vacuum dried at 100C for 24 hours, left in a desiccator until it reached room temperature, and weighed.
水Ｉ！！漬前の試験片重量と真空乾燥処理後の試験片重
量の差を試験片の乾燥減量とすると吸水性樹脂保持率は
次式で計３Ｅされる。Water I! ! If the difference between the weight of the test piece before soaking and the weight of the test piece after vacuum drying treatment is taken as the loss on drying of the test piece, the water-absorbing resin retention rate can be calculated as 3E in total using the following formula.
吸水性樹脂保持率（イ）−
水浸漬前の試験片中の吸水性樹脂重量（乃×１００
実施例１
吸水性樹脂として、デンプン−アクリル酸グラフト共重
合体アルカリ金属塩（三洋化成工業社製、「サンウェッ
ト ＩＭａ ｏ ｏ Ｊ ）ｌＬ鉢で粉砕し、篩分けに
より１００メツシュ篩を通過した粉末（含水量８．０重
ｆｉ−％）を、オーブン中１５０℃で含水＠１．０重量
％電食る迄加熱処理した。Water-absorbing resin retention rate (A) - weight of water-absorbing resin in the test piece before immersion in water (No x 100) , "Sunwet IMa o o J) The powder (moisture content: 8.0% by weight) that was crushed in a 1L bowl and passed through a 100 mesh sieve was sieved at 150°C in an oven to contain water @ 1.0% by weight. Heat treated until electrolytic corrosion occurred.
熱可塑性樹脂として、エチレン−酢酸ビニル共重合体（
三菱油化社製、［三菱ＥＶＡ Ｖ６ｏｔｓＪ）６０重
量％と、加熱処理した前記吸水性樹脂４０重量％とを、
ロールにて１２００で５分間溶噛混練することにより吸
水性樹脂組成物を製造した。Ethylene-vinyl acetate copolymer (
Mitsubishi Yuka Co., Ltd., [Mitsubishi EVA V6otsJ] 60% by weight and the heat-treated water absorbent resin 40% by weight,
A water absorbent resin composition was produced by melting and kneading with a roll for 5 minutes at 1200°C.
得られた組成物を１２０℃でプレス成形して０．１−厚
のシートとし、吸水率、および吸水性樹脂保持率を測定
した。その結果を表に示す。The obtained composition was press-molded at 120°C to form a 0.1-thick sheet, and the water absorption rate and water absorbent resin retention rate were measured. The results are shown in the table.
実施例２
吸水性樹脂として、デンプン−アクリロニトリルグラフ
ト共重合体ケン化物（８澱化学社製、ｒＷＡｓＪ）を用
いた外は、実施例１と同様にして、粉砕、加熱処理した
後、吸水性樹脂組成物を製造し、シートを成形した。Example 2 The water-absorbent resin was crushed and heat-treated in the same manner as in Example 1, except that a saponified starch-acrylonitrile graft copolymer (rWAsJ, manufactured by 8-Den Kagaku Co., Ltd.) was used as the water-absorbent resin. A composition was prepared and a sheet was formed.
比較例１
吸水性樹脂として、ポリアクリル酸アルカリ金属塩（製
鉄化学工業社製、［アクアキープ１０ＳＨＪ）を用いた
外は、実施例１と同様にして、粉砕、加熱処理した後、
吸水性樹脂組成物を製造し、シートを成形した。Comparative Example 1 After pulverization and heat treatment in the same manner as in Example 1, except that an alkali metal polyacrylate (manufactured by Seitetsu Kagaku Kogyo Co., Ltd., [Aqua Keep 10SHJ) was used as the water-absorbing resin,
A water absorbent resin composition was produced and a sheet was molded.
比較例２
吸水性樹脂として、ビ汗ルアルコールーアクリル酸共重
合体アルカリ金属塩（住友化学工業社製、「スミカゲル
５５０Ｊ）を用いた外は、実施例１と同様にして、粉
砕、加熱処理した後、吸水性樹脂組成物を製造し、シー
トを成形した。Comparative Example 2 Grinding and heat treatment were carried out in the same manner as in Example 1, except that alkali metal salt of dihydric alcohol-acrylic acid copolymer (Sumitomo Chemical Co., Ltd., "Sumikagel 550J") was used as the water-absorbing resin. After that, a water absorbent resin composition was produced and a sheet was molded.
実施例３、比較例３
５０メツシュ（実施例３）、４０メツシュ（比較例３）
の各部を通過する吸水性樹脂粉末を用いた外は、実施例
１と同様にして、吸水性樹脂組成物を製造し、シートを
成形した。Example 3, Comparative Example 3 50 mesh (Example 3), 40 mesh (Comparative Example 3)
A water-absorbing resin composition was produced in the same manner as in Example 1, except that the water-absorbing resin powder passing through each part was used, and a sheet was molded.
実施例４、比較例４
加熱処理の１品度を１００℃（実施例４）、８０℃（比
較例４）とした外は、実施例１と同様にして、吸水性樹
脂組成物を製造し、シートを成形した。Example 4, Comparative Example 4 Water-absorbing resin compositions were produced in the same manner as in Example 1, except that the heat treatment was performed at 100°C (Example 4) and 80°C (Comparative Example 4). , a sheet was formed.
実施例５．６、比較例５
含水量を１．６重量％（実施例５）、２．０重量％（実
施例６）、２．５重礒％（比較例５）とした外は、実施
例１と同様にして、吸水性樹脂組成物を製造し、シート
を成形した。Example 5.6, Comparative Example 5 Except that the water content was 1.6% by weight (Example 5), 2.0% by weight (Example 6), and 2.5% by weight (Comparative Example 5), A water absorbent resin composition was produced in the same manner as in Example 1, and a sheet was molded.
実施例７〜１０
熱可塑性樹脂またはゴムとして、低密度ポリエチレン（
実施例７）、ポリプロピレン（実施例８）、エチレン−
プロピレン共重合体ゴム（実施例９）、ポリ塩化ビニル
（実施例１ｏ）を用い、溶融湯、ｎ、温度とシート成形
温度を、それぞれ１６０℃、２００℃、２００℃、１６
０℃とした外は、実施例１と同様にして、吸水性樹脂組
成物を製造し、シートを成形した。Examples 7 to 10 Low density polyethylene (
Example 7), polypropylene (Example 8), ethylene-
Using propylene copolymer rubber (Example 9) and polyvinyl chloride (Example 1o), the molten metal, n, temperature and sheet forming temperature were 160°C, 200°C, 200°C and 16°C, respectively.
A water-absorbing resin composition was produced and a sheet was molded in the same manner as in Example 1, except that the temperature was 0°C.
実施例１１．１２
エチレン−酢酸ビニル共重合体と吸水性樹脂の配合割合
を４０重針にと６０重量％（実施例１１）、２０重量％
と８０重量％（実施例１２）とした外は、実施例１と同
様にして、吸水性樹脂組成物を製造し、シートを成形し
た。Example 11.12 The blending ratio of ethylene-vinyl acetate copolymer and water-absorbing resin was 40% by weight, 60% by weight (Example 11), and 20% by weight.
A water-absorbing resin composition was produced in the same manner as in Example 1, except that the amount was 80% by weight (Example 12), and a sheet was molded.
比較例６
１孜水性樹脂のｉｏｏメツシュ篩を通過した粉末（含水
ｉ８．Ｏｆｉ量％）を加熱処理せずに用いた外は、実施
例１と同様にして、吸水性樹脂組成物を製造し、シート
を成形した。Comparative Example 6 A water-absorbing resin composition was produced in the same manner as in Example 1, except that the powder of the water-based resin that had passed through the IOO mesh sieve (water content: 8.0%) was used without heat treatment. , a sheet was formed.
Claims (1)
９５〜５重量％とを溶融混練して吸水性樹脂組成物を製
造するにおいて、前記吸水性樹脂として５０メッシュ篩
を通過する粉末であつて、１００℃以上の温度で２重量
％以下の含水量に加熱処理されたデンプン系吸水性樹脂
を用いることを特徴とする吸水性樹脂組成物の製造方法
。In producing a water-absorbing resin composition by melt-kneading 5-95% by weight of a water-absorbing resin and 95-5% by weight of a thermoplastic resin or rubber, the water-absorbing resin is a powder that passes through a 50 mesh sieve. A method for producing a water-absorbing resin composition, characterized by using a starch-based water-absorbing resin that has been heat-treated to a water content of 2% by weight or less at a temperature of 100° C. or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14030387A JPS63304061A (en) | 1987-06-04 | 1987-06-04 | Production of water-absorbing polymer composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14030387A JPS63304061A (en) | 1987-06-04 | 1987-06-04 | Production of water-absorbing polymer composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63304061A true JPS63304061A (en) | 1988-12-12 |
Family
ID=15265649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14030387A Pending JPS63304061A (en) | 1987-06-04 | 1987-06-04 | Production of water-absorbing polymer composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63304061A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01252669A (en) * | 1988-03-31 | 1989-10-09 | Sumitomo Seika Chem Co Ltd | Water-absorptive water-retentive material |
| EP0425269A2 (en) * | 1989-10-25 | 1991-05-02 | Hoechst Celanese Corporation | Superabsorbent polymer fibers and processes for their production |
| US5095054A (en) * | 1988-02-03 | 1992-03-10 | Warner-Lambert Company | Polymer compositions containing destructurized starch |
-
1987
- 1987-06-04 JP JP14030387A patent/JPS63304061A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5095054A (en) * | 1988-02-03 | 1992-03-10 | Warner-Lambert Company | Polymer compositions containing destructurized starch |
| JPH01252669A (en) * | 1988-03-31 | 1989-10-09 | Sumitomo Seika Chem Co Ltd | Water-absorptive water-retentive material |
| EP0425269A2 (en) * | 1989-10-25 | 1991-05-02 | Hoechst Celanese Corporation | Superabsorbent polymer fibers and processes for their production |
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