JP6156868B2 - 蓄熱マイクロカプセルおよびその製造法 - Google Patents
蓄熱マイクロカプセルおよびその製造法 Download PDFInfo
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- JP6156868B2 JP6156868B2 JP2013102188A JP2013102188A JP6156868B2 JP 6156868 B2 JP6156868 B2 JP 6156868B2 JP 2013102188 A JP2013102188 A JP 2013102188A JP 2013102188 A JP2013102188 A JP 2013102188A JP 6156868 B2 JP6156868 B2 JP 6156868B2
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Description
一方で、重合開始剤を含む、二重結合を有する重合反応物質が数ミクロンから数十ミクロンに懸濁した(O/W)系エマルション溶液を用意する(第二工程)、
あらかじめ用意しておいた、上述のスラリーに、この(O/W)系エマルションを加え、(O+S)/W系エマルション溶液を形成させ、40〜80℃で撹拌・重合する事で、マイクロカプセル同士を合一接着させる(第三工程)、
を有する事を特徴とする。
を添加し,10%苛性ソーダ水溶液でpHを12にし、加熱溶解させ、次に、10%クエン酸でpH を8 にした。これを(水溶液1)とする。
蒸留水120gに35%ホルマリン水溶液13.8gとメラミン 2.52gを混合し,10%苛性ソーダ水溶液でpHを12とし、60℃で30分撹拌してプレポリマー水溶液を調製した。これを(水溶液2)とする。
この(O/W)系溶液1に(水溶液2)を加え、10%クエン酸を添加してpH を4.85 に設定した。80℃、200rpmで1h
撹拌することで、20〜50ミクロンサイズのテトラデカン内包メラミン樹脂被覆マイクロカプセルが調製できた。ろ過・洗浄・乾燥後、22.8gのマイクロカプセルが得られた。
次に、氷冷下、蓄熱材であるテトラデカン20.0gに、壁材としてジイソシアン酸トリレン2.0gを溶解させ、この溶液を中実粒子5.0gに含浸させたスラリー有機相を調製した。
Claims (2)
- 20〜50ミクロンサイズで小粒子径の蓄熱マイクロカプセルがアクリル樹脂を介して複数接着し200〜1000ミクロンサイズに集合してなる多核構造型マイクロカプセルであって、
前記蓄熱マイクロカプセルは、蓄熱材としてのテトラデカンが中実粒子に含浸されており、同中実粒子の表面にはメラミン樹脂上層被膜とポリウレア樹脂下層被膜とからなる二重膜が備えられていることを特徴とする過冷却が抑制された多核構造型マイクロカプセル。 - 壁材としてのジイソシアン酸トリレンが溶解した蓄熱材としてのテトラデカン溶液に中実粒子を氷冷下で添加して同中実粒子に前記テトラデカン溶液を含浸させつつスラリー有機相を調製し、攪拌機を備える反応容器内に予め収容したスチレン-無水マレイン酸共重合体加水分解物を含有する水溶液に前記スラリー有機相を添加し、70℃で撹拌することにより((O+S)/W)系エマルションを形成し、その後70℃で攪拌しながら反応させて中実粒子を骨格とするポリウレア膜被覆を備えた前駆マイクロカプセルを調製し、次いでクエン酸を添加して反応溶液のpHを4.8程度に調整し、これにメラミンと水とホルマリンと苛性ソーダとから構成された添加相を添加して70℃で攪拌しながら反応させて前記前駆マイクロカプセル表面にメラミン樹脂膜を形成して二重膜マイクロカプセルとし、ろ過し、洗浄し、乾燥して20〜50ミクロンサイズの小粒子径とした蓄熱マイクロカプセルを回収する第1工程と、
ベンゾイルパーオキサイドを溶解させたトリエチレンジメタクリエートをドデシルベンゼンスルホン酸ナトリウム水溶液に5℃の温度下で添加しミキサーに供して数ミクロン〜数十ミクロンサイズの懸濁油滴群よりなる(O/W)エマルション溶液を調製する第2工程と、
前記第1工程で回収した蓄熱マイクロカプセルをドデシルベンゼンスルホン酸ナトリウム水溶液に添加して攪拌分散させスラリーと成した後、同スラリーに前記第2工程で調製した(O/W)エマルション溶液を添加して攪拌しながら70℃にて重合反応を行って小粒子同士を接着し、200〜1000ミクロンサイズの多核構造型マイクロカプセルを得る第3工程と、を有することを特徴とする多核構造型マイクロカプセルの調製方法。
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