JP5214155B2 - 水溶性重合体製造装置および水溶性重合体の連続的製造方法 - Google Patents
水溶性重合体製造装置および水溶性重合体の連続的製造方法 Download PDFInfo
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- JP5214155B2 JP5214155B2 JP2007049455A JP2007049455A JP5214155B2 JP 5214155 B2 JP5214155 B2 JP 5214155B2 JP 2007049455 A JP2007049455 A JP 2007049455A JP 2007049455 A JP2007049455 A JP 2007049455A JP 5214155 B2 JP5214155 B2 JP 5214155B2
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Description
図1は、本発明の1つの実施形態による水溶性重合体製造装置を説明する概念図である。図2は、本発明の別の実施形態による水溶性重合体製造装置を説明する概念図である。水溶性重合体製造装置100は、タンク1と、循環ライン2と、排出ライン3とを備える。タンク1は、重合性不飽和結合を有する単量体を含む循環液を一時的に貯留する。循環ライン2は、タンク1の出口aから出て、タンク1の外部を循環し、タンク1の戻り口bに戻る(すなわち、循環ラインは、いわゆるループ型である)。循環ライン2には、通常、循環ポンプ6および混合装置5が設けられ、上記循環液を混合しながら循環させる。循環液が循環ラインを循環しながら、循環液中の単量体の重合が進行する。また、循環ライン2には、通常、単量体および各種添加剤供給口(図1および図2の形態においては、供給口7、8、9および10)が設けられている。なお、このような供給口は、タンク1の任意の位置に設けてもよい。本発明においては、循環ライン2は少なくとも1つの冷却器4を有する。循環ライン2に冷却器4を設けることにより、分子量分布の狭い水溶性重合体を得ることができる。さらに、本発明の製造装置においては、タンク1に特定の撹拌翼(後述)を用いる撹拌手段12が設けられている。1つの実施形態においては、このような撹拌手段12は、タンク内の循環液を0.5kW/m3以上の撹拌所要動力Pvで撹拌する。タンク内に特定の撹拌翼を用いる撹拌手段を設けることにより、工業規模の製造ラインにおいても分子量分布の狭い水溶性重合体を得ることができる。排出ライン3は、循環液の一部を循環ライン2から排出し、得られる重合体を回収する。以下、水溶性重合体製造装置の構成部について詳細に説明する。なお、本明細書においては、便宜上、タンクと循環ラインとを併せて「反応装置」と称することがあり、反応装置と排出ラインとを併せて「製造装置」と称することがある。さらに、単量体および各種添加剤をまとめて「原料」と称することがある。
本発明の水溶性重合体の連続的製造方法は、重合性不飽和結合を有する単量体を含む循環液を、タンク1から出て該タンクの外部を循環し該タンクに戻る循環ライン2に循環させながら該単量体を重合する。以下、詳細を説明する。
C−1.水溶性重合体
上記で得られる水溶性重合体が、洗剤用ビルダー、分散剤、スケール防止剤等として供される場合、その重量平均分子量(Mw)は、好ましくは1500〜30000であり、より好ましくは2000〜20000であり、さらに好ましくは3500〜15000であり、特に好ましくは4000〜12000である。また、上記水溶性重合体が、(メタ)アクリル酸(塩)のホモポリマーである場合には、その重量平均分子量(Mw)は、好ましくは1500〜30000であり、より好ましくは2000〜12000であり、さらに好ましくは2000〜10000である。このような分子量範囲において分子量分布(Mw/Mn)が狭くなることにより、同程度の重合度を有する重合体をより多く得られることとなる。その結果、例えば分散剤では分散性の向上等、各用途に要求される性能に好ましい影響を与えることとなる。Mw/Mnは、7以下が好ましく、5以下がより好ましく、3.5以下が更に好ましく、3.2以下が特に好ましく、2.7以下が最も好ましい。
上記単量体としては、任意の適切な単量体が用いられ得る。例えば、不飽和カルボン酸系単量体が好ましい。
本発明の製造方法に用いることのできる重合開始剤としては、レドックス開始剤、アゾ系開始剤、有機過酸化物、光開始剤等が好適である。具体的には、過硫酸ナトリウム、過硫酸アンモニウム、過硫酸カリウム等の過硫酸塩;過酸化水素;2,2’−アゾビス(2−アミジノプロパン)2塩酸塩、4,4’−アゾビス(4−シアノバレリン酸)、アゾビスイソブチルニトリル、2,2’−アゾビス(4−メトキシ−2,4−ジメチルバレロニトリル)等のアゾ系化合物;過酸化ベンゾイル、過酸化ラウロイル、過酢酸、過コハク酸、ジ−t−ブチルパーオキサイド、t−ブチルヒドロパーオキサイド、クメンヒドロパーオキサイド等の有機過酸化物等が挙げられる。これらは、1種類のみであっても2種類以上含んでいてもよい。中でも、レドックス開始剤、アゾ系開始剤、有機過酸化物が好ましい。具体的には、過硫酸塩、過酸化水素、有機過酸化物、2,2’−アゾビス(2−アミジノプロパン)2塩酸塩が好ましく、過硫酸塩、過酸化水素、2,2’−アゾビス(2−アミジノプロパン)2塩酸塩がより好ましく、過硫酸塩、過酸化水素が更に好ましい。
上記連鎖移動剤としては、特に限定されず、亜硫酸(塩)、亜硫酸水素(塩)、ピロ亜硫酸(塩)、亜リン酸(塩)、次亜リン酸(塩)、チオグリコール酸、チオグリコール酸オクチル、チオプロピオン酸、チオプロピオン酸オクチル、n−ドデシルメルカプタン、t−ドデシルメルカプタン、エチレングリコールジチオグリコレート、エチレングリコールジチオプロピオネート、1,4−ブタンジオールチオグリコレート、トリメチロールプロパントリチオグリコレート、トリメチロールプロパントリチオプロピオネート、ペンタエリスリトールテトラキスチオグリコレート、ペンタエリスリトールテトラキスチオプロピオネート、ジペンタエリスリトールヘキサキスチオグリコレート、ジペンタエリスリトールヘキサキスチオプロピオネート等のメルカプト基含有化合物、ブタンチオール、オクタンチオール、デカンチオール、ヘキサデカンチオール、オクタデカンチオール、シクロヘキシルメルカプタン、チオフェノール、メルカプトエタノール、チオグリセロール、チオリンゴ酸、2−メルカプトエタンスルホン酸等のメルカプタン系化合物、イソプロパノール、グリセリン等の2級アルコール等を用いることができる。
上記重合中の反応溶液のpHを調整したり、単量体を中和したりするためのアルカリ剤(pH調整剤又は中和剤とも言う。)としては、水酸化ナトリウム、水酸化カリウム等のアルカリ金属の水酸化物、水酸化カルシウム、水酸化マグネシウム等のアルカリ土類金属の水酸化物、アンモニア、モノエタノールアミン、トリエタノールアミン等の有機アミン塩等が挙げられる。これらは1種単独で用いてもよいし、2種以上を併用してもよい。これらの中でも、水酸化ナトリウム、水酸化カリウム等のアルカリ金属の水酸化物とアンモニアが好ましく、水酸化ナトリウムとアンモニアがより好ましい。
上記酸化剤としては、酸素、オゾン、過酸化水素、過硫酸塩、過塩素酸塩、過マンガン酸塩、ニクロム酸塩、臭素酸塩、硝酸(塩)、次亜塩素酸塩等が好適である。酸化剤は、開始剤の種類や装置等への腐食性、得られる水溶性重合体に残存する成分により選択可能であるが、その中でも、酸素、オゾン、過酸化水素、過硫酸塩が好ましい。
上記単量体を水溶液中で重合する際に重合反応系に用いることのできる他の添加剤としては、本発明の作用効果に影響を与えない範囲で適当な添加剤を適量加えることができる。例えば、重金属含有化合物、有機過酸化物、過酸化水素(H2O2)と金属塩等が用いることが好適である。このような添加剤を用いることにより、反応を速めることができ、生産効率の観点からこれらを添加することが好ましい。上記重金属含有化合物としては、例えば、上述した複数の酸化数を有する金属を構成成分とする金属単体、塩及び/又は錯体に記載のものを添加剤として用いることができる。
本発明は更に、水溶性重合体を含有してなる洗剤、水処理剤又は分散剤でもある。すなわち、ゲルパーミエーションクロマトグラフィー(GPC)において、標準ポリアクリル酸ソーダを使用した検量線から得られた分子量(Mp)にて2500なる保持時間と7000なる保持時間に含まれる区間の面積強度が、該ポリマー全体の面積強度に対して38.0%以上である、ポリマー末端に硫黄及び/又はリンが結合したポリアクリル酸及び/又とその塩であり、上記クレイ分散性試験において、0.85以上の分散性を示し、かつ数平均分子量(Mn)が2000〜3000の範囲にあることを特徴とする洗剤、洗剤組成物、水処理剤及び/又は顔料分散剤もまた本発明の好ましい形態の一つである。
2Lのガラス製セパラブルフラスコに、反応液抜き出し用のポンプと、当該フラスコから出て当該フラスコ外部を循環し当該フラスコに戻る、開度調節が可能な循環ラインとを設置した。循環ラインには、原料供給口、冷却器およびスタティックミキサーを設けた。さらに、循環ラインから分岐して排出ラインを設けた。加えて、フラスコ内に4枚パドル撹拌翼を設置した。このようにして、ループライン型反応器(重合体製造装置)を作製した。
4枚パドル撹拌翼の代わりにマックスブレンド(登録商標)型撹拌翼を用いたこと以外は実施例1と同様にして水溶性重合体を得た。撹拌翼で与えた撹拌所要動力Pvは2.5kW/m3であった。中和後、得られた重合体の分子量をGPCにより測定したところ、重量平均分子量Mwは8,296、分子量分布は2.751であった。
4枚パドル撹拌翼の代わりに錨型撹拌翼(翼長/槽内径=0.9、翼幅/槽内径=0.1)を用いたこと以外は実施例1と同様にして水溶性重合体を得た。撹拌翼で与えた撹拌所要動力Pvは2.5kW/m3であった。中和後、得られた重合体の分子量をGPCにより測定したところ、重量平均分子量Mwは7,842、分子量分布は2.628であった。
2Lのガラス製セパラブルフラスコに水350gとモール塩を加え、90℃まで加熱した。その条件下でテフロン製撹拌羽根(通常のパドル型)により撹拌を行いつつ、フラスコ内の温度が90℃を維持するように風冷しながら、フラスコ内に80重量%アクリル酸水溶液、48重量%水酸化ナトリウム水溶液、35重量%亜硫酸水素ナトリウム水溶液、15質量%過硫酸ナトリウム(ペルオキソ二硫酸ナトリウム)水溶液を表1に示す規定量加えた。本比較例で用いた撹拌翼で与えた撹拌所要動力Pvは1.02kW/m3であった。なお添加の速度は表1に示す通りであり、分子量の調整は亜硫酸水素ナトリウムの増減により行なった。原料の供給が終わった後30分間温度を保ち、その後冷却して48質量%水酸化ナトリウムを加えpH7となるまで中和した。
y = a ln x + b ・・・(1)
式(1)において、yは分子量分布であり、xは重量平均分子量であり、lnはネイピア数eを底とした対数(自然対数)である。式(1)から、実施例1〜3で得られた重合体と同等の重量平均分子量において、バッチ重合で得られた重合体の推定分子量分布を算出した。結果を表2に示す。また、実施例1で得られた重合体の重量平均分子量に近い重量平均分子量(Mw:5,963)を有する、バッチ重合で実際に得られた重合体の分子量分布は2.501であった。さらに、実施例2で得られた重合体の重量平均分子量に近い重量平均分子量(Mw:8,354)を有する、バッチ重合で実際に得られた重合体の分子量分布は2.826であった。加えて、実施例3で得られた重合体の重量平均分子量に近い重量平均分子量(Mw:7,746)を有する、バッチ重合で実際に得られた重合体の分子量分布は2.728であった。実施例1〜3および比較例1〜4の重合体の重量平均分子量と分子量分布との関係を図4に示す。
表1の比較例1−7の処方において、撹拌所要動力Pvを2.5kW/m3に変更したこと以外は比較例1−7と同様にして、水溶性重合体を得た。中和後、得られた重合体の分子量をGPCにより測定したところ、重量平均分子量Mwは6,810、分子量分布は2.621であった。
マックスブレンド(登録商標)型撹拌翼を用いたこと以外は比較例2と同様にして、水溶性重合体を得た。中和後、得られた重合体の分子量をGPCにより測定したところ、重量平均分子量Mwは6,392、分子量分布は2.598であった。
アンカー翼を用いたこと以外は比較例2と同様にして、水溶性重合体を得た。中和後、得られた重合体の分子量をGPCにより測定したところ、重量平均分子量Mwは6,107、分子量分布は2.555であった。
1 タンク
2 循環ライン
3 排出ライン
4 冷却器
5 混合装置
6 循環ポンプ
7 アルカリ剤供給口
8 単量体供給口
9 連鎖移動剤供給口
10 重合開始剤供給口
11 剤供給口
12 撹拌手段
a タンク出口
b タンク戻り口
Claims (8)
- 不飽和カルボン酸系単量体を含有する単量体を含む循環液を一時的に貯留するタンクと、
該タンクから出て該タンクの外部を循環し該タンクに戻り、該循環液を循環させる循環ラインと、
該循環液の一部を排出する排出ラインと、を備え、
該循環ラインが少なくとも1つの冷却器と、少なくとも1つの単量体供給口と、少なくとも1つの混合装置と、少なくとも1つの重合開始剤供給口と、を有し
該冷却器、該単量体供給口、該混合装置および該重合開始剤供給口が、該循環ライン内の循環液の流路方向に沿って冷却器/単量体供給口/混合装置/重合開始剤供給口の順、または、冷却器/単量体供給口/重合開始剤供給口/混合装置の順で配置されており、
該タンクにパドル型撹拌翼、錨型撹拌翼、格子型撹拌翼および大型平板翼からなる群から選択される撹拌翼を用いた撹拌手段が設けられている
水溶性重合体製造装置。 - 前記排出ラインが、前記循環ラインから分かれて設けられている、請求項1に記載の水溶性重合体製造装置。
- 前記混合装置がモーションレスミキサーである、請求項1または2に記載の水溶性重合体製造装置。
- 前記重合開始剤供給口から供給される重合開始剤が、過硫酸塩および/または過酸化水素である、請求項1から3のいずれかに記載の水溶性重合体製造装置。
- 前記循環ラインが連鎖移動剤供給口をさらに有し、該連鎖移動剤供給口から供給される連鎖移動剤が、亜硫酸(塩)、亜硫酸水素(塩)、ピロ亜硫酸(塩)、亜リン酸(塩)、次亜リン酸(塩)、メルカプト基含有化合物、メルカプタン系化合物および2級アルコールから選択される、請求項1から4のいずれかに記載の水溶性重合体製造装置。
- 不飽和カルボン酸系単量体を含有する単量体を含む循環液を、タンクから出て該タンクの外部を循環し該タンクに戻る循環ラインに循環させながら該単量体を重合する、水溶性重合体の連続的製造方法であって、
該循環ラインの少なくとも1ヶ所で該循環液を冷却する工程と、
該循環ラインの少なくとも1ヶ所で該循環液を混合する工程と、
該循環液の一部を該循環ライン外に排出する工程と、
該タンク内の循環液を撹拌する工程と、を含み、
該循環ラインにおいて冷却工程後かつ混合工程前に単量体を供給し、かつ、混合工程後に重合開始剤を供給するか、冷却工程後かつ混合工程前に単量体および重合開始剤を供給することを含み、
該撹拌が、パドル型撹拌翼、錨型撹拌翼、格子型撹拌翼および大型平板翼からなる群から選択される撹拌翼を用いて行われる
水溶性重合体の連続的製造方法。 - 前記重合開始剤が、過硫酸塩および/または過酸化水素である、請求項6に記載の水溶性重合体の連続的製造方法。
- 前記循環ラインにおいて連鎖移動剤を供給することをさらに含み、該連鎖移動剤が、亜硫酸(塩)、亜硫酸水素(塩)、ピロ亜硫酸(塩)、亜リン酸(塩)、次亜リン酸(塩)、メルカプト基含有化合物、メルカプタン系化合物および2級アルコールから選択される、請求項6または7に記載の水溶性重合体の連続的製造方法。
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