JP7163646B2 - Manufacturing method of core-shell emulsion for water-based printing ink and core-shell emulsion for water-based printing ink - Google Patents
Manufacturing method of core-shell emulsion for water-based printing ink and core-shell emulsion for water-based printing ink Download PDFInfo
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Description
本発明は水性印刷インキ用、とりわけ水性フレキソインキ、水性グラビアインキ用のコアシェルエマルションの製造方法および水性印刷インキ用コアシェルエマルションに関するものである。 TECHNICAL FIELD The present invention relates to a method for producing a core-shell emulsion for water-based printing inks, especially water-based flexographic inks and water-based gravure inks, and to a core-shell emulsion for water-based printing inks.
近年、省資源化や環境負荷の観点から、印刷インキの水性化が行われており、さらには非石油系の天然資源である、バイオマス原料の使用が進められている。また、バイオマス原料の中でも、とりわけ植物由来の原料を有効に使用する方法が求められている。 BACKGROUND ART In recent years, from the viewpoint of resource saving and environmental impact, the use of water-based printing inks has been promoted, and the use of biomass raw materials, which are non-petroleum natural resources, has been promoted. In addition, among biomass materials, there is a demand for a method of effectively using, in particular, plant-derived materials.
植物由来の原料としては、リグニン、ロジン、澱粉等が挙げられるが、いずれも天然物由来の着色が生じることから、インキとして使用した時、白色印刷時に白色度の低下が生じることが課題となっている。これらの植物由来の原料を変性や精製することにより、水性印刷インキに適する、水性の材料を得るための方法が検討されている。 Plant-derived raw materials include lignin, rosin, starch, and the like, but all of them cause coloration derived from natural products. ing. Methods for obtaining water-based materials suitable for water-based printing inks by modifying or purifying these plant-derived raw materials have been investigated.
澱粉を使用したインキについて、特許文献１では、顔料と有機溶剤と樹脂からなる印刷インキにおける、樹脂の部分に有機溶剤可溶性の澱粉脂肪酸エステルを使用しているが、これは多量の有機溶剤を含有した澱粉の溶液であり、水性印刷インキに適する、水性の材料では無かった。 Regarding starch-based inks, Patent Document 1 discloses that an organic solvent-soluble starch fatty acid ester is used in the resin portion of a printing ink consisting of a pigment, an organic solvent, and a resin, which contains a large amount of organic solvent. It was a solution of diluted starch and was not a water-based material suitable for water-based printing inks.
水性の澱粉を用いた材料に関して、特許文献２では、澱粉と糖類と変性ポリビニルアルコールの存在下、ビニルモノマーを重合させたエマルションを開発しているが、これは接着剤であり、エマルション由来の白色度の低下を含む、印刷インキに言及したものでは無かった。 Regarding materials using aqueous starch, Patent Document 2 develops an emulsion in which a vinyl monomer is polymerized in the presence of starch, sugars, and modified polyvinyl alcohol. No mention was made of the printing inks, including the reduction in viscosity.
本発明は、水性印刷インキに適用可能な、植物由来の原料を使用したコアシェルエマルションを提供することを目的とする。 An object of the present invention is to provide a core-shell emulsion using plant-derived raw materials, which is applicable to water-based printing ink.
本発明者らは、前記課題を解決するために鋭意検討を行った結果、水、変性澱粉存在下、ビニル基含有モノマーをラジカル重合して得るコアシェルエマルションにおいて、シェルとして用いる変性澱粉の重量平均分子量とその含有量を特定の範囲とすることで、変性澱粉に由来する白色度の低下を抑制することが可能であることを見出した。これにより、水性印刷インキに適用可能な、植物由来の原料として変性澱粉を使用する、コアシェルエマルションの開発に至った。 As a result of intensive studies to solve the above problems, the present inventors have found that, in a core-shell emulsion obtained by radically polymerizing a vinyl group-containing monomer in the presence of water and modified starch, the modified starch used as the shell has a weight-average molecular weight of and its content in a specific range, it was found that it is possible to suppress the decrease in whiteness derived from modified starch. This led to the development of a core-shell emulsion using modified starch as a plant-derived raw material, which is applicable to water-based printing inks.
すなわち、本発明は、
（１）水及び変性澱粉（ａ）の存在下にビニル基含有モノマー（ｂ）をラジカル重合して得られるコアシェルエマルションを含有し、変性澱粉（ａ）の重量平均分子量が５０００～１５万の範囲であり、変性澱粉（ａ）の含有量が２０～５０質量％であることを特徴とする水性印刷インキ用コアシェルエマルションの製造方法、
（２）ビニル基含有モノマー（ｂ）がスチレン類、(メタ)アクリル酸アルキルエステルを含有する疎水性モノマーであることを特徴とする前記（１）に記載の水性印刷インキ用コアシェルエマルションの製造方法、
（３）変性澱粉（ａ）がシェル、ビニル基含有モノマー（ｂ）をラジカル重合して得るポリマーがコアであることを特徴とする前記（１）に記載の水性印刷インキ用コアシェルエマルションの製造方法、
（４）少なくとも水、変性澱粉（ａ）及びビニル基含有モノマー（ｂ）の重合物からなるコアシェルエマルションを含有し、変性澱粉（ａ）の重量平均分子量が５０００～１５万の範囲であり、変性澱粉（ａ）の含有量が２０～５０質量％であることを特徴とする水性印刷インキ用コアシェルエマルション、
（５）ビニル基含有モノマー（ｂ）がスチレン類、(メタ)アクリル酸アルキルエステルを含有する疎水性モノマーであることを特徴とする前記（４）に記載の水性印刷インキ用コアシェルエマルション、
（６）変性澱粉（ａ）がシェル、ビニル基含有モノマー（ｂ）をラジカル重合して得るポリマーがコアであることを特徴とする前記（４）に記載の水性印刷インキ用コアシェルエマルション、
である。
That is, the present invention
(1) It contains a core-shell emulsion obtained by radically polymerizing a vinyl group-containing monomer (b) in the presence of water and modified starch (a), and the modified starch (a) has a weight average molecular weight in the range of 5,000 to 150,000. A method for producing a core-shell emulsion for water-based printing ink, characterized in that the content of the modified starch (a) is 20 to 50% by mass,
(2) The method for producing a core-shell emulsion for water-based printing ink according to (1) above, wherein the vinyl group-containing monomer (b) is a hydrophobic monomer containing a styrene or a (meth)acrylic acid alkyl ester. ,
(3) The method for producing a core-shell emulsion for water-based printing ink according to (1) above, wherein the modified starch (a) is the shell and the polymer obtained by radically polymerizing the vinyl group-containing monomer (b) is the core. ,
(4) containing at least water, a core-shell emulsion consisting of a polymer of modified starch (a) and a vinyl group-containing monomer (b), wherein the weight average molecular weight of the modified starch (a) is in the range of 5000 to 150,000; A core-shell emulsion for water-based printing ink, characterized in that the content of starch (a) is 20 to 50% by mass;
(5) The core-shell emulsion for water-based printing ink according to (4) above, wherein the vinyl group-containing monomer (b) is a hydrophobic monomer containing a styrene or a (meth)acrylic acid alkyl ester;
(6) The core-shell emulsion for water-based printing ink according to (4) above, wherein the modified starch (a) is the shell and the polymer obtained by radically polymerizing the vinyl group-containing monomer (b) is the core.
is.
本発明で得られる水性印刷インキ用コアシェルエマルションを用いることにより、変性澱粉に由来する白色度の低下を抑制し、植物由来である変性澱粉を含むことにより、省資源化、環境負荷の低減に対応した水性印刷インキを得ることが可能になる。 By using the core-shell emulsion for water-based printing ink obtained by the present invention, the decrease in whiteness caused by modified starch is suppressed, and by containing plant-derived modified starch, it is possible to save resources and reduce the environmental load. water-based printing inks can be obtained.
以下に本発明の水性印刷インキ用コアシェルエマルションの製造方法について、具体的に説明する。 The method for producing the core-shell emulsion for water-based printing ink of the present invention is specifically described below.
本発明は、水、変性澱粉（ａ）存在下、ビニル基含有モノマー（ｂ）をラジカル重合して得る、水性印刷インキ用コアシェルエマルション（Ａ）であり、変性澱粉（ａ）の重量平均分子量が５０００～１５万の範囲であり、コアシェルエマルションの固形分中に占める変性澱粉（ａ） の含有量が２０～５０質量％である水性印刷インキ用コアシェルエマルションの製造方法である。 The present invention is a core-shell emulsion (A) for water-based printing ink obtained by radical polymerization of a vinyl group-containing monomer (b) in the presence of water and modified starch (a), wherein the modified starch (a) has a weight average molecular weight of It is in the range of 5,000 to 150,000, and the content of the modified starch (a) in the solid content of the core-shell emulsion is 20 to 50% by mass.
（変性澱粉）
本発明の水性印刷インキ用コアシェルエマルションの製造に用いる変性澱粉（ａ）は、その重量平均分子量が５０００～１５万の範囲である必要がある。５０００未満であると、シェルとしての乳化性が不足するため、コアシェルエマルションを得ることが難しく、１５万を超えると、変性澱粉に由来する白色度の低下が顕著となる。なお、変性澱粉（ａ）の重量平均分子量は、以下の条件によりＧＰＣ法で測定したものである。
カラム：ＴＳＫｇｅｌ Ｇ６０００ＰＷｘｌ(東ソー製)とＴＳＫｇｅｌ Ｇ３０００ＰＷｘｌ（東ソー製）を2本連結して使用
ガードカラム：Ｇｕａｒｄｃｏｌｕｍ ＰＷｘｌ（東ソー製）
溶離液：リン酸二水素ナトリウム二水和物（２０ｍｍｏｌ／Ｌ）、リン酸水素二ナトリウム十二水和物（２０ｍｍｏｌ／Ｌ）の水溶液
流速：１．０ｍＬ／分
カラム温度：４５℃
サンプル濃度：０．５％
スタンダード：ポリエチレングリコール（Ｍｗ１０１０、４０４０、１６１００、４４２００、１４６０００）
(modified starch)
The modified starch (a) used for producing the core-shell emulsion for water-based printing ink of the present invention must have a weight average molecular weight in the range of 5,000 to 150,000. If it is less than 5,000, the emulsifiability of the shell is insufficient, making it difficult to obtain a core-shell emulsion. The weight average molecular weight of modified starch (a) is measured by GPC method under the following conditions.
Column: TSKgel G6000PWxl (manufactured by Tosoh) and TSKgel G3000PWxl (manufactured by Tosoh) are used by connecting two columns Guard column: Guardcolumn PWxl (manufactured by Tosoh)
Eluent: aqueous solution of sodium dihydrogen phosphate dihydrate (20 mmol/L) and disodium hydrogen phosphate dodecahydrate (20 mmol/L) Flow rate: 1.0 mL/min Column temperature: 45°C
Sample concentration: 0.5%
Standard: polyethylene glycol (Mw 1010, 4040, 16100, 44200, 146000)
変性澱粉（ａ）の使用量は、コアシェルエマルションの固形分中に占めるその含有量が２０～５０質量％であることが好ましい。２０質量％未満であると、シェルとしての乳化性が不足するため、コアシェルエマルションを得ることが難しく、５０質量％を超えると、変性澱粉に由来する白色度の低下が顕著となる。 The modified starch (a) is preferably used in an amount of 20 to 50% by mass based on the solid content of the core-shell emulsion. If it is less than 20% by mass, the emulsifiability of the shell is insufficient, making it difficult to obtain a core-shell emulsion.
変性澱粉の原料となる澱粉の品種は、特に限定されず、例えばトウモロコシ、タピオカ、馬鈴薯、米、小麦、モチトウモロコシ等の澱粉を使用することが出来る。
変性澱粉としては、例えば酸化澱粉、両性澱粉、リン酸澱粉、ヒドロキシプロピル化やヒドロキシエチル化等のエーテル化澱粉、アセチル化澱粉、脂肪酸エステル化澱粉、α化デンプン、尿素変性澱粉、酵素変性澱粉等が使用可能である。この中でも、酸化澱粉、リン酸澱粉、エーテル化澱粉を使用することが、好ましい。
The variety of starch used as a raw material for modified starch is not particularly limited, and starches such as corn, tapioca, potato, rice, wheat, and waxy corn can be used.
Examples of modified starch include oxidized starch, amphoteric starch, phosphate starch, etherified starch such as hydroxypropylated and hydroxyethylated starch, acetylated starch, fatty acid esterified starch, pregelatinized starch, urea-modified starch, enzyme-modified starch, and the like. is available. Among these, it is preferable to use oxidized starch, phosphate starch, and etherified starch.
（ビニル基含有モノマー（ｂ））
ビニル基含有モノマー（ｂ）は、特に限定されないが、２０℃での水への溶解度が２質量％未満である疎水性モノマーが好ましく、スチレン類やアルキル基の炭素数が１～８である（メタ）アクリル酸アルキルエステルが好ましい。スチレン類としては、例えば、スチレン、αメチルスチレン等のスチレン類；炭素数が１～８である（メタ）アクリル酸アルキルエステルとしては、(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸ブチル、(メタ)アクリル酸２－エチルキシル等の(メタ)アクリル酸エステル類が挙げられる。また、疎水性モノマー以外のビニル基含有モノマー（ｂ）としては、例えば、ジビニルベンゼン、エチレングリコールジメタクリレート等の２官能性モノマー；グリシジルメタクリレート等の架橋性モノマー；アクリル酸、メタクリル酸等のアニオン性モノマー；アクリルアミド、ダイアセトンアクリルアミド等のノニオン性モノマーが挙げられる。
(Vinyl group-containing monomer (b))
The vinyl group-containing monomer (b) is not particularly limited, but is preferably a hydrophobic monomer having a solubility in water of less than 2% by mass at 20° C., and styrenes or alkyl groups having 1 to 8 carbon atoms ( Meth)acrylic acid alkyl esters are preferred. Examples of styrenes include styrenes such as styrene and α-methylstyrene; Examples of (meth)acrylic acid alkyl esters having 1 to 8 carbon atoms include methyl (meth)acrylate, ethyl (meth)acrylate, ( (Meth)acrylic esters such as butyl methacrylate and 2-ethylxyl (meth)acrylate. Examples of vinyl group-containing monomers (b) other than hydrophobic monomers include bifunctional monomers such as divinylbenzene and ethylene glycol dimethacrylate; crosslinkable monomers such as glycidyl methacrylate; anionic monomers such as acrylic acid and methacrylic acid; Monomer; nonionic monomers such as acrylamide and diacetone acrylamide.
（その他）
本発明の水性印刷インキ用コアシェルエマルションの製造方法においては、発明の効果を損なわない限り、必要に応じて、低分子や高分子の乳化剤を使用しても良い。乳化剤としては、脂肪酸ポリグリコールエステル、ポリアルキレンオキサイド型等のノニオン性乳化剤や、ドデシルベンゼンスルホン酸ナトリウム、ポリオキシエチレンスチレン化フェノール硫酸化ナトリウム、ナフタレンスルホン酸ナトリウムのホルマリン縮合物、スチレンアクリル酸共重合物のアルカリ塩等のアニオン性乳化剤を用いることが出来る。これらは、前記（ｂ）に対して０．１～５０質量％を限度に用いることができる。
(others)
In the method for producing the core-shell emulsion for water-based printing ink of the present invention, a low-molecular-weight or high-molecular-weight emulsifier may be used, if necessary, as long as the effects of the invention are not impaired. Examples of emulsifiers include nonionic emulsifiers such as fatty acid polyglycol esters and polyalkylene oxides, formalin condensates of sodium dodecylbenzenesulfonate, sodium polyoxyethylene styrenated phenol sulfate, sodium naphthalenesulfonate, and styrene-acrylic acid copolymers. Anionic emulsifiers, such as alkaline salts of solubles, can be used. These can be used up to a limit of 0.1 to 50% by mass with respect to the above (b).
（ラジカル重合）
本発明で行うラジカル重合の方法は、従来公知の乳化重合の方法を適用することが出来る。例えば、攪拌機、および窒素ガス導入管を備えた反応容器に、水、変性澱粉（ａ）を仕込み、重合開始剤として過硫酸アンモニウム、過硫酸カリウム、過酸化水素等の過酸化物、あるいはこれらの過酸化物と硫酸亜鉄、重亜硫酸ソーダ、アスコルビン酸、アスコルビン酸ナトリウム等の還元剤との組み合わせからなる任意のレドックス開始剤を使用し、反応温度を４０～９０℃にて、ビニル基含有モノマー類（ｂ）を１～３時間かけて滴下し、滴下終了後１～８時間反応させることで、水性印刷インキ用コアシェルエマルションを得ることが出来る。
(radical polymerization)
A conventionally known emulsion polymerization method can be applied to the method of radical polymerization performed in the present invention. For example, a reaction vessel equipped with a stirrer and a nitrogen gas inlet tube is charged with water and modified starch (a), and ammonium persulfate, potassium persulfate, a peroxide such as hydrogen peroxide, or a peroxide thereof as a polymerization initiator. Using any redox initiator consisting of a combination of an oxide and a reducing agent such as ferrous sulfate, sodium bisulfite, ascorbic acid, sodium ascorbate, at a reaction temperature of 40 to 90 ° C., vinyl group-containing monomers A core-shell emulsion for water-based printing ink can be obtained by dropping (b) over 1 to 3 hours and reacting for 1 to 8 hours after completion of dropping.
以下、実施例および比較例により、本発明を詳細に説明する。なお、％は特に記載がない限り、質量％である。実施例で用いた変性澱粉（ａ）については、全て水分含有率が１２％だった。 EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples. In addition, % is mass % unless otherwise specified. All of the modified starches (a) used in Examples had a moisture content of 12%.
＜水性印刷インキ用コアシェルエマルション（Ａ）の製造方法＞
実施例で用いた変性澱粉（ａ）については、重量平均分子量（Mｗ）を、以下の条件によりＧＰＣ法で測定した。
カラム：ＴＳＫｇｅｌ Ｇ６０００ＰＷｘｌ(東ソー製)とＴＳＫｇｅｌ Ｇ３０００ＰＷｘｌ（東ソー製）を2本連結して使用
ガードカラム：Ｇｕａｒｄｃｏｌｕｍ ＰＷｘｌ（東ソー製）
溶離液：リン酸二水素ナトリウム二水和物（２０ｍｍｏｌ／Ｌ）、リン酸水素二ナトリウム十二水和物（２０ｍｍｏｌ／Ｌ）の水溶液
流速：１．０ｍＬ／分
カラム温度：４５℃
サンプル濃度：０．５％
スタンダード：ポリエチレングリコール（Ｍｗ１０１０、４０４０、１６１００、４４２００、１４６０００）
<Method for producing core-shell emulsion (A) for water-based printing ink>
For the modified starch (a) used in the examples, the weight average molecular weight (Mw) was measured by the GPC method under the following conditions.
Column: TSKgel G6000PWxl (manufactured by Tosoh) and TSKgel G3000PWxl (manufactured by Tosoh) are used by connecting two columns Guard column: Guardcolumn PWxl (manufactured by Tosoh)
Eluent: aqueous solution of sodium dihydrogen phosphate dihydrate (20 mmol/L) and disodium hydrogen phosphate dodecahydrate (20 mmol/L) Flow rate: 1.0 mL/min Column temperature: 45°C
Sample concentration: 0.5%
Standard: polyethylene glycol (Mw 1010, 4040, 16100, 44200, 146000)
実施例１
温度計、冷却管、撹拌機を有するセパラブルフラスコに、イオン交換水（４６０ｇ）、変性澱粉（ａ）としてブリバインＰ－６３（日澱化学製、Ｍｗ５６００、リン酸澱粉、１８４ｇ）を仕込み、窒素置換下で、９０℃まで昇温し、１時間保持した。次いで、２８%アンモニア水溶液（２８．９ｇ）を加え、冷却し、８０℃でイオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（１２．２ｇ）を添加し、ビニル基含有モノマー（ｂ）としてスチレン（１４５ｇ）、アクリル酸ｎ－ブチル（９８ｇ）の混合液を３時間かけて滴下した。滴下終了後、８０℃で２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（４．９ｇ）を添加した。２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（４．９ｇ）を添加し、さらに４時間保持した。その後冷却し、イオン交換水にて４０％濃度に希釈して、ｐＨ７．８、粘度２２０ｍＰａ・ｓの水性印刷インキ用コアシェルエマルション（Ａ１）を得た。
Example 1
A separable flask equipped with a thermometer, a condenser, and a stirrer was charged with ion-exchanged water (460 g) and Buribain P-63 (Mw5600, starch phosphate, 184 g, manufactured by Nichiden Kagaku Co., Ltd.) as modified starch (a). The temperature was raised to 90° C. under replacement and maintained for 1 hour. Then, a 28% aqueous ammonia solution (28.9 g) was added, cooled, and ammonium persulfate (12.2 g) diluted with deionized water at 80° C. to a concentration of 10% was added to obtain a vinyl group-containing monomer (b). A mixture of styrene (145 g) and n-butyl acrylate (98 g) was added dropwise over 3 hours. After completion of dropping, the mixture was held at 80° C. for 2 hours, and then ammonium persulfate (4.9 g) diluted to 10% concentration with deionized water was added. After holding for 2 hours, ammonium persulfate (4.9 g) diluted with ion-exchanged water to a concentration of 10% was added, and the mixture was held for an additional 4 hours. After that, it was cooled and diluted with deionized water to a concentration of 40% to obtain a core-shell emulsion (A1) for water-based printing ink having a pH of 7.8 and a viscosity of 220 mPa·s.
実施例２
変性澱粉（ａ）として王子エースＣ(王子コーンスターチ製、Ｍｗ３１０００、酸化澱粉)を使用した以外は、実施例１と同様にして、ｐＨ７．７、粘度、２５０ｍＰａ・ｓの水性印刷インキ用コアシェルエマルション（Ａ２）を得た。
Example 2
A core-shell emulsion for water-based printing ink having a pH of 7.7 and a viscosity of 250 mPa s was prepared in the same manner as in Example 1, except that Oji Ace C (manufactured by Oji Cornstarch, Mw 31000, oxidized starch) was used as the modified starch (a) ( A2) was obtained.
実施例３
変性澱粉（ａ）として王子エースＡ(王子コーンスターチ製、Ｍｗ６３０００、酸化澱粉)を使用した以外は、実施例１と同様にして、pH7.7、粘度、３００ｍＰａ・ｓの水性印刷インキ用コアシェルエマルション（Ａ３）を得た。
Example 3
A core-shell emulsion for water-based printing ink having a pH of 7.7 and a viscosity of 300 mPa s was prepared in the same manner as in Example 1, except that Oji Ace A (Mw63000, oxidized starch manufactured by Oji Cornstarch Co., Ltd.) was used as the modified starch (a). A3) was obtained.
実施例４
変性澱粉（ａ）としてＰＥＮＯＮ ＰＫＷ(日澱化学製、Ｍｗ１３８０００、ヒドロキシプロピル澱粉)を使用した以外は、実施例１と同様にして、ｐＨ７．９、粘度、２４０ｍＰａ・ｓの水性印刷インキ用コアシェルエマルション（Ａ４）を得た。
Example 4
A core-shell emulsion for water-based printing ink having a pH of 7.9 and a viscosity of 240 mPa s was prepared in the same manner as in Example 1 except that PENON PKW (Mw138000, hydroxypropyl starch manufactured by Nichiden Kagaku Co., Ltd.) was used as the modified starch (a). (A4) was obtained.
実施例５
ビニル基含有モノマー（ｂ）としてメタクリル酸メチル（１４５ｇ）、アクリル酸ｎ－ブチル（９８ｇ）の混合液を３時間かけて滴下した以外は、実施例１と同様にして、ｐＨ７．８、粘度、３５０ｍＰａ・ｓの水性印刷インキ用コアシェルエマルション（Ａ５）を得た。
Example 5
In the same manner as in Example 1, except that a mixture of methyl methacrylate (145 g) and n-butyl acrylate (98 g) was added dropwise over 3 hours as the vinyl group-containing monomer (b), pH was 7.8, viscosity was A 350 mPa·s core-shell emulsion for water-based printing ink (A5) was obtained.
実施例６
温度計、冷却管、撹拌機を有するセパラブルフラスコに、イオン交換水（３７０ｇ）、変性澱粉（ａ）としてブリバインＰ－６３（日澱化学製、Ｍｗ５６００、リン酸澱粉、１８４ｇ）を仕込み、窒素置換下で、９０℃まで昇温し、１時間保持した。次いで、２８％アンモニア水溶液（２８．９ｇ）を加え、冷却し、８０℃でイオン交換水にて１２％濃度に希釈した過酸化水素（７２．９ｇ）、イオン交換水にて９％濃度に希釈した硫酸亜鉄（４．６ｇ）を添加し、ビニル基含有モノマー（ｂ）としてスチレン（１４５ｇ）、アクリル酸ｎ－ブチル（９８ｇ）の混合液を３時間かけて滴下した。滴下終了後、８０℃で２時間保持した後、イオン交換水にて１２％濃度に希釈した過酸化水素（１１．２ｇ）を添加した。２時間保持した後、イオン交換水にて１２％濃度に希釈した過酸化水素（１１．２ｇ）を添加し、さらに４時間保持した。その後冷却し、イオン交換水にて４０％濃度に希釈して、ｐＨ７．７、粘度３５０ｍＰａ・ｓの水性印刷インキ用コアシェルエマルション（Ａ６）を得た。
Example 6
A separable flask equipped with a thermometer, a condenser, and a stirrer was charged with ion-exchanged water (370 g) and Buribain P-63 (manufactured by Nichiden Chemical Co., Ltd., Mw 5600, starch phosphate, 184 g) as modified starch (a). The temperature was raised to 90° C. under replacement and maintained for 1 hour. Next, 28% aqueous ammonia solution (28.9 g) was added, cooled, hydrogen peroxide (72.9 g) diluted to 12% concentration with deionized water at 80°C, and diluted to 9% concentration with deionized water. A mixed solution of styrene (145 g) and n-butyl acrylate (98 g) as a vinyl group-containing monomer (b) was added dropwise over 3 hours. After completion of dropping, the mixture was held at 80° C. for 2 hours, and then hydrogen peroxide (11.2 g) diluted to 12% concentration with deionized water was added. After holding for 2 hours, hydrogen peroxide (11.2 g) diluted with ion-exchanged water to a concentration of 12% was added, and the mixture was held for an additional 4 hours. After that, it was cooled and diluted with deionized water to a concentration of 40% to obtain a core-shell emulsion for water-based printing ink (A6) having a pH of 7.7 and a viscosity of 350 mPa·s.
実施例７
温度計、冷却管、撹拌機を有するセパラブルフラスコに、イオン交換水（４５０ｇ）、変性澱粉（ａ）としてブリバインＰ－６３（日澱化学製、Ｍｗ５６００、リン酸澱粉、１８４ｇ）を仕込み、窒素置換下で、９０℃まで昇温し、１時間保持した。次いで、低分子乳化剤としてネオゲンＳ２０(第一工業製薬製、２０％濃度のドデシルベンゼンスルホン酸ナトリウム塩水溶液、１４．２ｇ)、２８％アンモニア水溶液（２８．９ｇ）を加え、冷却し、８０℃でイオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（１２．２ｇ）を添加し、ビニル基含有モノマー（ｂ）としてスチレン（１４５ｇ）、アクリル酸ｎ－ブチル（９８ｇ）の混合液を３時間かけて滴下した。滴下終了後、８０℃で２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（４．９ｇ）を添加した。２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（４．９ｇ）を添加し、さらに４時間保持した。その後冷却し、イオン交換水にて４０％濃度に希釈して、ｐＨ７．７、粘度２８０ｍＰａ・ｓの水性印刷インキ用コアシェルエマルション（Ａ７）を得た。
Example 7
A separable flask equipped with a thermometer, a condenser, and a stirrer was charged with deionized water (450 g) and Buribain P-63 (Mw5600, starch phosphate, 184 g, manufactured by Nichiden Kagaku Co., Ltd.) as modified starch (a). The temperature was raised to 90° C. under replacement and maintained for 1 hour. Next, Neogen S20 (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., 20% aqueous solution of sodium dodecylbenzenesulfonate, 14.2 g) and 28% aqueous ammonia solution (28.9 g) were added as a low-molecular emulsifier, and cooled to 80°C. Ammonium persulfate (12.2 g) diluted to 10% concentration with ion-exchanged water was added, and a mixed solution of styrene (145 g) and n-butyl acrylate (98 g) as a vinyl group-containing monomer (b) was added over 3 hours. dripped. After completion of dropping, the mixture was held at 80° C. for 2 hours, and then ammonium persulfate (4.9 g) diluted to 10% concentration with deionized water was added. After holding for 2 hours, ammonium persulfate (4.9 g) diluted with ion-exchanged water to a concentration of 10% was added, and the mixture was held for an additional 4 hours. After that, it was cooled and diluted with deionized water to a concentration of 40% to obtain a core-shell emulsion (A7) for water-based printing ink having a pH of 7.7 and a viscosity of 280 mPa·s.
実施例８
温度計、冷却管、撹拌機を有するセパラブルフラスコに、イオン交換水（４５０ｇ）、変性澱粉（ａ）としてブリバインＰ－６３（日澱化学製、Ｍｗ５６００、リン酸澱粉、１８４ｇ）を仕込み、窒素置換下で、９０℃まで昇温し、１時間保持した。次いで、高分子乳化剤としてＹＬ－１０９８(星光ＰＭＣ製、３６％濃度のスチレンアクリル系樹脂の水溶液、１１２．５ｇ)、２８％アンモニア水溶液（２８．９ｇ）を加え、冷却し、８０℃でイオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（１０．２ｇ）を添加し、ビニル基含有モノマー（ｂ）としてスチレン（１２１ｇ）、アクリル酸ｎ－ブチル（８１ｇ）の混合液を３時間かけて滴下した。滴下終了後、８０℃で２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（４．１ｇ）を添加した。２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（４．１ｇ）を添加し、さらに４時間保持した。その後冷却し、イオン交換水にて４０％濃度に希釈して、ｐＨ８．３、粘度４１０ｍＰａ・ｓの水性印刷インキ用コアシェルエマルション（Ａ８）を得た。
Example 8
A separable flask equipped with a thermometer, a condenser, and a stirrer was charged with deionized water (450 g) and Buribain P-63 (Mw5600, starch phosphate, 184 g, manufactured by Nichiden Kagaku Co., Ltd.) as modified starch (a). The temperature was raised to 90° C. under replacement and maintained for 1 hour. Next, YL-1098 (manufactured by Seiko PMC, 112.5 g of aqueous solution of styrene-acrylic resin with a concentration of 36%) as a polymer emulsifier and 28% aqueous ammonia solution (28.9 g) were added, cooled, and ion-exchanged at 80°C. Ammonium persulfate (10.2 g) diluted with water to a concentration of 10% was added, and a mixture of styrene (121 g) and n-butyl acrylate (81 g) as a vinyl group-containing monomer (b) was added dropwise over 3 hours. did. After completion of dropping, the mixture was held at 80° C. for 2 hours, and then ammonium persulfate (4.1 g) diluted to 10% concentration with deionized water was added. After holding for 2 hours, ammonium persulfate (4.1 g) diluted with ion-exchanged water to a concentration of 10% was added, and the mixture was held for an additional 4 hours. After that, it was cooled and diluted with deionized water to a concentration of 40% to obtain a core-shell emulsion for water-based printing ink (A8) having a pH of 8.3 and a viscosity of 410 mPa·s.
実施例９
温度計、冷却管、撹拌機を有するセパラブルフラスコに、イオン交換水（４６０ｇ）、変性澱粉（ａ）としてブリバインＰ－６３（日澱化学製、Ｍｗ５６００、リン酸澱粉、９２ｇ）を仕込み、窒素置換下で、９０℃まで昇温し、１時間保持した。次いで、２８％アンモニア水溶液（１４．５ｇ）を加え、冷却し、８０℃でイオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（１６．３ｇ）を添加し、ビニル基含有モノマー（ｂ）としてスチレン（１９４ｇ）、アクリル酸ｎ－ブチル（１３０ｇ）の混合液を３時間かけて滴下した。滴下終了後、８０℃で２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（６．５ｇ）を添加した。２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（６．５ｇ）を添加し、さらに４時間保持した。その後冷却し、イオン交換水にて４０％濃度に希釈して、ｐＨ７．５、粘度７０ｍＰａ・ｓの水性印刷インキ用コアシェルエマルション（Ａ９）を得た。
Example 9
A separable flask equipped with a thermometer, a condenser, and a stirrer was charged with ion-exchanged water (460 g) and Buribain P-63 (Mw5600, starch phosphate, 92 g, manufactured by Nichiden Kagaku Co., Ltd.) as modified starch (a). The temperature was raised to 90° C. under replacement and maintained for 1 hour. Then, a 28% aqueous ammonia solution (14.5 g) was added, cooled, and ammonium persulfate (16.3 g) diluted with deionized water at 80° C. to a concentration of 10% was added to obtain a vinyl group-containing monomer (b). A mixture of styrene (194 g) and n-butyl acrylate (130 g) was added dropwise over 3 hours. After completion of the dropwise addition, the mixture was held at 80° C. for 2 hours, and then ammonium persulfate (6.5 g) diluted with ion-exchanged water to a concentration of 10% was added. After holding for 2 hours, ammonium persulfate (6.5 g) diluted with ion-exchanged water to a concentration of 10% was added, and the mixture was held for an additional 4 hours. After that, it was cooled and diluted with deionized water to a concentration of 40% to obtain a core-shell emulsion for water-based printing ink (A9) having a pH of 7.5 and a viscosity of 70 mPa·s.
実施例１０
温度計、冷却管、撹拌機を有するセパラブルフラスコに、イオン交換水（４６０ｇ）、変性澱粉（ａ）としてブリバインＰ－６３（日澱化学製、Ｍｗ５６００、リン酸澱粉、２３０ｇ）を仕込み、窒素置換下で、９０℃まで昇温し、１時間保持した。次いで、２８％アンモニア水溶液（５７．８ｇ）を加え、冷却し、８０℃でイオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（１０．２ｇ）を添加し、ビニル基含有モノマー（ｂ）としてスチレン（１２１ｇ）、アクリル酸ｎ－ブチル（８１ｇ）の混合液を３時間かけて滴下した。滴下終了後、８０℃で２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（４．１ｇ）を添加した。２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（４．１ｇ）を添加し、さらに４時間保持した。その後冷却し、イオン交換水にて４０％濃度に希釈して、ｐＨ７．７、粘度５５０ｍＰａ・ｓの水性印刷インキ用コアシェルエマルション（Ａ１０）を得た。
Example 10
A separable flask equipped with a thermometer, a condenser, and a stirrer was charged with ion-exchanged water (460 g) and Buribain P-63 (Mw5600, starch phosphate, 230 g, manufactured by Nichiden Kagaku Co., Ltd.) as modified starch (a). The temperature was raised to 90° C. under replacement and maintained for 1 hour. Then, a 28% aqueous ammonia solution (57.8 g) was added, cooled, and ammonium persulfate (10.2 g) diluted with deionized water at 80° C. to a concentration of 10% was added to obtain a vinyl group-containing monomer (b). A mixture of styrene (121 g) and n-butyl acrylate (81 g) was added dropwise over 3 hours. After completion of dropping, the mixture was held at 80° C. for 2 hours, and then ammonium persulfate (4.1 g) diluted to 10% concentration with deionized water was added. After holding for 2 hours, ammonium persulfate (4.1 g) diluted with ion-exchanged water to a concentration of 10% was added, and the mixture was held for an additional 4 hours. After that, it was cooled and diluted with deionized water to a concentration of 40% to obtain a core-shell emulsion for water-based printing ink (A10) having a pH of 7.7 and a viscosity of 550 mPa·s.
比較例１
・製造方法に関して、変性澱粉（ａ）としてスターコート♯１４（日本食品化工製、Ｍｗ２１００００、リン酸澱粉）を使用した以外は、実施例１と同様にして、ｐＨ７．９、粘度、２８０ｍＰａ・ｓの水性印刷インキ用コアシェルエマルション（Ａ１１）を得た。
Comparative example 1
-Regarding the production method, the same procedure as in Example 1 was performed except that Starcoat #14 (manufactured by Nihon Shokuhin Kako, Mw210000, starch phosphate) was used as the modified starch (a), pH 7.9, viscosity, 280 mPa s. A core-shell emulsion (A11) for water-based printing ink was obtained.
比較例２
温度計、冷却管、撹拌機を有するセパラブルフラスコに、イオン交換水（４６０ｇ）、変性澱粉（ａ）としてブリバインＰ－６３（日澱化学製、Ｍｗ５６００、リン酸澱粉、１８４ｇ）、αアミラーゼ（０．０１６ｇ）を仕込み、窒素置換下で、９０℃まで昇温し、１時間保持した。この段階で、澱粉の分子量をＧＰＣにて測定したところ、重量平均分子量は４１００であった。次いで、２８％アンモニア水溶液（２８．９ｇ）を加え、冷却し、８０℃でイオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（１２．２ｇ）を添加し、ビニル基含有モノマー（ｂ）としてスチレン（１４５ｇ）、アクリル酸ｎ－ブチル（９８ｇ）の混合液を３時間かけて滴下した。滴下終了後、８０℃で２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（４．９ｇ）を添加した。２時間保持した時点で、内容物がゲル化した。
Comparative example 2
In a separable flask equipped with a thermometer, a condenser, and a stirrer, ion-exchanged water (460 g), Buribain P-63 (Mw5600, starch phosphate, 184 g, manufactured by Nippon Denki Kagaku Co., Ltd.) as modified starch (a), α-amylase ( 0.016 g) was charged, and under nitrogen substitution, the temperature was raised to 90° C. and maintained for 1 hour. At this stage, when the molecular weight of the starch was measured by GPC, the weight average molecular weight was 4,100. Then, a 28% aqueous ammonia solution (28.9 g) was added, cooled, and ammonium persulfate (12.2 g) diluted with deionized water at 80° C. to a concentration of 10% was added to obtain a vinyl group-containing monomer (b). A mixture of styrene (145 g) and n-butyl acrylate (98 g) was added dropwise over 3 hours. After completion of dropping, the mixture was held at 80° C. for 2 hours, and then ammonium persulfate (4.9 g) diluted to 10% concentration with deionized water was added. After holding for 2 hours, the contents gelled.
比較例３
温度計、冷却管、撹拌機を有するセパラブルフラスコに、イオン交換水（４６０ｇ）、変性澱粉（ａ）としてブリバインＰ－６３（日澱化学製、Ｍｗ５６００、リン酸澱粉、４６ｇ）を仕込み、窒素置換下で、９０℃まで昇温し、１時間保持した。次いで、２８％アンモニア水溶液（７．３ｇ）を加え、冷却し、８０℃でイオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（１８．３ｇ）を添加し、ビニル基含有モノマー（ｂ）としてスチレン（２１９ｇ）、アクリル酸ｎ－ブチル（１４６ｇ）の混合液を３時間かけて滴下した。滴下終了後、８０℃で２時間保持した時点で、内容物がゲル化した。
Comparative example 3
A separable flask equipped with a thermometer, a condenser, and a stirrer was charged with ion-exchanged water (460 g) and Buribain P-63 (Mw5600, starch phosphate, 46 g, manufactured by Nichiden Kagaku Co., Ltd.) as modified starch (a). The temperature was raised to 90° C. under replacement and maintained for 1 hour. Then, a 28% aqueous ammonia solution (7.3 g) was added, cooled, and ammonium persulfate (18.3 g) diluted with deionized water at 80° C. to a concentration of 10% was added to obtain a vinyl group-containing monomer (b). A mixture of styrene (219 g) and n-butyl acrylate (146 g) was added dropwise over 3 hours. After the dropwise addition, the contents gelled when the contents were held at 80° C. for 2 hours.
比較例４
温度計、冷却管、撹拌機を有するセパラブルフラスコに、イオン交換水（４６０ｇ）、変性澱粉（ａ）としてブリバインＰ－６３（日澱化学製、Ｍｗ５６００、リン酸澱粉、２７６ｇ）を仕込み、窒素置換下で、９０℃まで昇温し、１時間保持した。次いで、２８％アンモニア水溶液（４３．４ｇ）を加え、冷却し、８０℃でイオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（８．１ｇ）を添加し、ビニル基含有モノマー（ｂ）としてスチレン（９７ｇ）、アクリル酸ｎ－ブチル（６５ｇ）の混合液を３時間かけて滴下した。滴下終了後、８０℃で２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（３．３ｇ）を添加した。２時間保持した後、イオン交換水にて１０％濃度に希釈した過硫酸アンモニウム（３．３ｇ）を添加し、さらに４時間保持した。その後冷却し、イオン交換水にて４０％濃度に希釈して、ｐＨ８．０、粘度８８０ｍＰａ・ｓのコアシェルエマルション（Ａ１４）を得た。
Comparative example 4
A separable flask equipped with a thermometer, a condenser, and a stirrer was charged with ion-exchanged water (460 g) and Buribain P-63 (Mw5600, starch phosphate, 276 g, manufactured by Nichiden Kagaku Co., Ltd.) as modified starch (a). The temperature was raised to 90° C. under replacement and maintained for 1 hour. Then, a 28% aqueous ammonia solution (43.4 g) was added, cooled, and ammonium persulfate (8.1 g) diluted with deionized water at 80° C. to a concentration of 10% was added to obtain a vinyl group-containing monomer (b). A mixture of styrene (97 g) and n-butyl acrylate (65 g) was added dropwise over 3 hours. After completion of the dropwise addition, the mixture was held at 80° C. for 2 hours, and then ammonium persulfate (3.3 g) diluted with ion-exchanged water to a concentration of 10% was added. After holding for 2 hours, ammonium persulfate (3.3 g) diluted with ion-exchanged water to a concentration of 10% was added, and the mixture was held for an additional 4 hours. It was then cooled and diluted with deionized water to a concentration of 40% to obtain a core-shell emulsion (A14) having a pH of 8.0 and a viscosity of 880 mPa·s.
（塗工評価）
ワイヤーバー♯５を用いて、コート紙（白色、坪量１８０ｇ／ｍ２、白色度８９．０)の片面に水性印刷インキ用コアエマルション（Ａ１～Ａ１０、Ａ１４）を塗工した。塗工液の塗布量は５ｇ／ｍ２であった。塗工後、白色度を測定した。なお、白色度は、Ｃｏｌｏｒ ｍｅｔｅｒ ＺＥ６０００（日本電色工業株式会社製）にて測定した。
(Coating evaluation)
Using a wire bar #5, core emulsions for water-based printing inks (A1 to A10, A14) were coated on one side of coated paper (white, basis weight 180 g/m 2 , whiteness degree 89.0). The coating amount of the coating liquid was 5 g/m 2 . After coating, the whiteness was measured. The whiteness was measured with a Color meter ZE6000 (manufactured by Nippon Denshoku Industries Co., Ltd.).
※１ Ｓｔ(スチレン)、ＢＡ(アクリル酸ｎ-ブチル)、ＭＭＡ(メタクリル酸メチル)
※２ ＡＰＳ(過硫酸アンモニウム)、Ｈ２Ｏ２(過酸化水素)
※３ コアシェルエマルションの固形分中に占める澱粉の含有量。質量％を記載。
*1 St (styrene), BA (n-butyl acrylate), MMA (methyl methacrylate)
* 2 APS (ammonium persulfate), H2O2 ( hydrogen peroxide)
*3 Starch content in the solid content of the core-shell emulsion. Describe mass %.
実施例１～４と比較例１より、澱粉の分子量が５０００～１５万の時、白色度の低下が小さいことが分かる。 From Examples 1 to 4 and Comparative Example 1, it can be seen that when the molecular weight of starch is 5,000 to 150,000, the decrease in whiteness is small.
実施例１～４と比較例２より、澱粉の分子量が５０００未満であると、乳化性不足により、エマルションを得ることは難しいことが分かる。 From Examples 1 to 4 and Comparative Example 2, it can be seen that when the molecular weight of starch is less than 5000, it is difficult to obtain an emulsion due to insufficient emulsifiability.
実施例１、９、１０と比較例３、４より、澱粉の量が２０％未満であると、乳化性不足により、エマルションを得ることは難しく、澱粉の量が５０％を超えると、白色度の低下が大きいことが分かる。 According to Examples 1, 9, 10 and Comparative Examples 3, 4, if the amount of starch is less than 20%, it is difficult to obtain an emulsion due to insufficient emulsifiability, and if the amount of starch exceeds 50%, the whiteness It can be seen that the decrease in
Claims (6)
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| JP2002513824A (en) | 1998-05-07 | 2002-05-14 | エス・シー・ジョンソン・コマーシャル・マーケッツ・インコーポレーテッド | Starch degradation / graft polymerization composition, polymerization method and use thereof |
| JP2006052338A (en) | 2004-08-12 | 2006-02-23 | Kansai Paint Co Ltd | Water dispersion of modified starch-containing resin and method for producing the water dispersion |
| JP2011057722A (en) | 2009-09-04 | 2011-03-24 | Nippon Shokuhin Kako Co Ltd | Method for producing starch derivative-containing aqueous emulsion, and starch derivative-containing aqueous emulsion obtained by the same |
| JP2011195809A (en) | 2010-02-26 | 2011-10-06 | Saiden Chemical Industry Co Ltd | Method for producing polymer composition |
| JP2013535518A (en) | 2010-06-30 | 2013-09-12 | デサン コーポレーション | Method for producing adhesive material for water-based paint |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002513824A (en) | 1998-05-07 | 2002-05-14 | エス・シー・ジョンソン・コマーシャル・マーケッツ・インコーポレーテッド | Starch degradation / graft polymerization composition, polymerization method and use thereof |
| JP2006052338A (en) | 2004-08-12 | 2006-02-23 | Kansai Paint Co Ltd | Water dispersion of modified starch-containing resin and method for producing the water dispersion |
| JP2011057722A (en) | 2009-09-04 | 2011-03-24 | Nippon Shokuhin Kako Co Ltd | Method for producing starch derivative-containing aqueous emulsion, and starch derivative-containing aqueous emulsion obtained by the same |
| JP2011195809A (en) | 2010-02-26 | 2011-10-06 | Saiden Chemical Industry Co Ltd | Method for producing polymer composition |
| JP2013535518A (en) | 2010-06-30 | 2013-09-12 | デサン コーポレーション | Method for producing adhesive material for water-based paint |
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