JP7149474B2 - 潜熱蓄熱体マイクロカプセルおよび潜熱蓄熱体マイクロカプセルの製造方法 - Google Patents
潜熱蓄熱体マイクロカプセルおよび潜熱蓄熱体マイクロカプセルの製造方法 Download PDFInfo
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Description
Al(OH)3→0.5Al2O3+1.5H2O↑
図1は、本発明に係る潜熱蓄熱体100の構造を概念的に説明するための断面図である。図中、符号10で示したものは、潜熱蓄熱材料から成る半径がRのコア粒子であり、このコア粒子10は、例えばAl基合金(例えばAl-Si合金)から成り、その表面は、Al酸化物の被膜20で被覆されている。α-Al2O3は化学的に安定であり、酸化被膜20として好適である。なお、本発明の方法では、Al酸化物の被膜20の形成に寄与するAl3+イオンは外部から供給されるため、コア粒子がAlを含まない組成の合金(金属)である場合にも効果的であるが、以降の説明では、コア粒子がAl合金(Al-Si合金)であるものとして説明する。
本発明においては、上述したAl-Si合金から成るコア粒子の表面を、Alイオンを含む溶液中でベーマイト処理して一次被膜を形成し(第1のステップ)、続いて、溶液をAlイオンが過飽和となる温度にまで冷却して一次被膜の表面にアルミニウム水酸化物を析出させて二次被膜を形成し(第2のステップ)、さらに、二次被膜を酸化雰囲気中で熱処理してコア粒子の表面にAl酸化被膜を形成する(第3のステップ)。
上述のとおり、本発明に係る潜熱蓄熱マイクロカプセルの製造方法では、先ず、Al基合金から成るコア粒子の表面をAlイオンを含む溶液中でベーマイト処理して一次被膜を形成し、続いて、上記溶液をAlイオンが過飽和となる温度にまで冷却して一次被膜の表面にアルミニウム水酸化物を析出させて二次被膜を形成し、この二次被膜を酸化雰囲気中で熱処理してコア粒子の表面にAl酸化被膜を形成する。
本発明では、ベーマイト処理液中にAlイオンを含ませ、このAlイオンの作用により一次被膜および二次被膜を形成している。従って、溶液中のAlイオンの濃度が高い程、被膜の厚みを厚くでき、その結果、シェルの肉厚化が図られることが期待される。そこで、この点を確認すべく、ベーマイト処理液中のAl(OH)3を変えた場合の、形成される被膜の状態を比較した。
次に、ベーマイト処理液中に、被膜形成の核を発生させ易くするための薬剤としての核発生促進剤を含有させた場合の効果について調べた。なお、ここでは、核発生促進剤としてドデシル硫酸ナトリウムCH3(CH2)11SO4Na(NaDS:sodium dodecyl sulfate)を含有させたが、NaDS以外にも、C18H35O2Na(Sodium stearate)、CH3(CH2)12CH2(OCH2CH2)nOSO3Na(Sodium myreth sulfate)、CH3(CH2)12CH2(OCH2CH2)nOSO3Na(Sodium myreth sulfate)、CH3(CH2)11(OCH2CH2)nOSO3Na(Sodium laureth sulfate)などを例示することができる。
以下に、酸化被膜の微細構造について説明するが、予め説明しておくと、第1の酸化被膜(緻密な酸化被膜)と第2の酸化被膜(多孔質の酸化被膜)が上述した「一次被膜」に対応し、第3の酸化被膜(第2の酸化被膜とは構造が異なる多孔質の酸化被膜)が上述した「二次被膜」に対応する。つまり、上述した第1のステップ(化成被膜処理)では、第1の酸化被膜と第2の酸化被膜が同時に形成される。そして、第2のステップ(一次被膜の表面にアルミニウム水酸化物を析出させるステップ)では、この一次被膜の表面に第3の酸化被膜が形成される。そして、これら第1~3の酸化被膜が熱処理されると、例えばAl2O3被膜となる。
20 酸化被膜
21a 一次被膜
21b 二次被膜
100 潜熱蓄熱体
Claims (1)
- Al-Si合金から成るコア粒子の表面が酸化被膜で被覆されている潜熱蓄熱体マイクロカプセルであって、
前記酸化被膜は、前記コア粒子の表面を直接被覆する第1の酸化被膜と、該第1の酸化被膜を被覆する第2の酸化被膜と、該第2の酸化被膜を被覆する第3の酸化被膜から成る3層の酸化被膜であり、
前記第1の酸化被膜は、α-Al2O3の非多孔質の緻密な酸化被膜であり、
前記第2の酸化被膜は、主としてα-Al2O3からなる多孔質の酸化被膜であり、
前記第3の酸化被膜は、前記第2の酸化被膜とは構造が異なる多孔質の酸化被膜であって、Al(OH)3由来のα-Al2O3とθ-Al2O3が混在する多孔質の酸化被膜であり、κ-Al2O3を含有せず、略直方体状の結晶となっている、
ことを特徴とする潜熱蓄熱体マイクロカプセル。
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JP7339645B2 (ja) * | 2018-05-21 | 2023-09-06 | 国立大学法人北海道大学 | 潜熱蓄熱体、潜熱蓄熱体の製造方法、及び、熱交換材料 |
US11154434B2 (en) | 2018-06-15 | 2021-10-26 | Essity Hygiene And Health Aktiebolag | Absorbent article |
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US20220298401A1 (en) | 2019-08-23 | 2022-09-22 | National University Corporation Hokkaido University | Microcapsule for latent heat storage materials, method for producing same, powder containing microcapsules for latent heat storage materials, and heat storage device comprising said powder |
CN114341309A (zh) * | 2019-08-27 | 2022-04-12 | 国立大学法人北海道大学 | 潜热蓄热体微囊及其制造方法 |
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JP2022127429A (ja) * | 2021-02-19 | 2022-08-31 | 国立大学法人北海道大学 | 潜熱蓄熱材用マイクロカプセル及びその製造方法、当該潜熱蓄熱材用マイクロカプセルを含む粉末、並びに、当該粉末を含む蓄熱装置 |
CN117916339A (zh) * | 2021-09-07 | 2024-04-19 | 国立大学法人北海道大学 | 潜热蓄热粒子、热交换材料、和潜热蓄热粒子的制造方法 |
WO2024090586A1 (ja) * | 2022-10-28 | 2024-05-02 | 株式会社日本触媒 | 潜熱蓄熱材組成物、潜熱蓄熱材成形体、及び潜熱蓄熱材成形体の製造方法 |
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