JP2020026489A - 石炭用酸化防止剤及び石炭の酸化防止方法 - Google Patents
石炭用酸化防止剤及び石炭の酸化防止方法 Download PDFInfo
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- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明の石炭用酸化防止剤は、エマルション粒子の平均粒子径が0.3μm以上0.6μm以下である水中油滴型樹脂エマルションを含有する。そして、石炭用酸化防止剤は、界面活性剤をさらに含有することが好ましい。
樹脂エマルションにおける樹脂の種類は、特に限定されるものでないが、アクリル酸系、メタクリル酸系、及び酢酸ビニル系から選択される1種以上を含むことが好ましい。中でも、アクリル酸ブチル共重合物、及び酢酸ビニル・アクリル酸共重合体から選択される1種以上をを含むことがより好ましい。そして、アクリル酸ブチル・メタクリル酸メチル共重合物、酢酸ビニル・酢酸ブチル・アクリル酸2エチルへキシル共重合体、ブタジエン・スチレン・アクリル酸共重合体、酢酸ビニル・酢酸ブチル・アクリル酸2エチルへキシル共重合体、及び酢酸ビニル・アクリル酸エステル共重合物から選択される1種以上を含むことが好ましい。
石炭用酸化防止剤は、界面活性剤をさらに含有することが好ましい。
本実施形態に係る石炭の酸化防止方法は、上記の樹脂エマルションを石炭堆積物(石炭山)に散布する。上記の樹脂エマルションと、上記の界面活性剤とを混合したものを石炭堆積物(石炭山)に散布することがより好ましい。
本実施形態では、水中油滴型樹脂エマルションを単独で石炭用酸化防止剤としてもよいし、水中油滴型樹脂エマルションと界面活性剤との混合物を石炭用酸化防止剤としてもよい。水中油滴型樹脂エマルションと界面活性剤とを混合する場合、水中油滴型樹脂エマルションと界面活性剤とが事前に混合された混合物を現場に持参してもよいし、水中油滴型樹脂エマルションと界面活性剤とを現場に個別に持参し、現場にて各々の材料を混合してもよい。
続いて、石炭用酸化防止剤を石炭堆積物(石炭山)に散布する。散布の手段として、レインガンや散水車、あるいはスタッカーやリクレーマーからのホースでの散布等の手段を用いることができる。
粒径2.0mm以下の石炭を高さ5cmに堆積させた後、この堆積物に対して表1に示す各薬剤(石炭用酸化防止剤)の15%濃度水溶液又は水分散液を約2L、有効成分として300g/m2−石炭面積となるように散布してテストピースとした。そして、テストピースを室温で1週間放置した。
(A)水中油滴型樹脂エマルション
水中油滴型樹脂エマルションは、アクリル酸共重合物のエマルションである。
(B)界面活性剤
ノニオン系界面活性剤は、ポリオキシアルキレンアルキルエーテル系の界面活性剤である。
カチオン系界面活性剤は、トリアルキルベンジルアンモニウム塩系の界面活性剤である。
アニオン系界面活性剤は、スルホコハク酸ジ−2−エチルへキシルNa塩系の界面活性剤である。
両性系界面活性剤は、脂肪酸アミドプロピルベタイン系の界面活性剤である。
石炭用酸化防止剤に含まれる水中油滴型樹脂エマルション中のエマルション粒子の平均粒子径が0.3μmあるい0.6μmである場合、石炭用酸化防止剤が樹脂エマルションを含まない場合(分散後液が水だけである比較例1、あるいは石炭用酸化防止剤が水とノニオン系界面活性剤だけである比較例6)に比べ、石炭堆積物(石炭山)を透過する酸素の透過量を35%以上抑えることができる(実施例1〜10)。この結果から、堆積中の石炭表面に樹脂エマルションの希釈液を散布することで、石炭の酸化反応を抑制でき、結果として、自然発熱を抑制し自然発火に至る限界温度に達する期間を延ばすことができるといえる。また、この効果は、石炭用酸化防止剤が樹脂エマルションを含んでいれば、界面活性剤を含んでいなくても得られる(実施例1及び6)。
Claims (4)
- エマルション粒子の平均粒子径が0.3μm以上1.0μm以下である水中油滴型樹脂エマルションを含有する石炭用酸化防止剤。
- 界面活性剤をさらに含有する、請求項1に記載の石炭用酸化防止剤。
- エマルション粒子の平均粒子径が0.3μm以上1.0μm以下である水中油滴型樹脂エマルションを含有する石炭用酸化防止剤を石炭堆積物に散布する、石炭の酸化防止方法。
- 前記水中油滴型樹脂エマルションと界面活性剤とを混合して前記石炭用酸化防止剤を調製する、請求項3に記載の石炭の酸化防止方法。
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JP2018152252A JP2020026489A (ja) | 2018-08-13 | 2018-08-13 | 石炭用酸化防止剤及び石炭の酸化防止方法 |
KR1020217001413A KR20210020140A (ko) | 2018-08-13 | 2019-04-11 | 석탄용 산화방지제 및 석탄의 산화방지방법 |
PCT/JP2019/015786 WO2020035973A1 (ja) | 2018-08-13 | 2019-04-11 | 石炭用酸化防止剤及び石炭の酸化防止方法 |
EP19849474.2A EP3800235A4 (en) | 2018-08-13 | 2019-04-11 | CHARCOAL ANTI-OXIDATION AGENT AND PROCESS FOR PREVENTING CHARCOAL OXIDATION |
US17/266,109 US20210292674A1 (en) | 2018-08-13 | 2019-04-11 | Antioxidant for coal and method for preventing oxidation of coal |
CN201980040595.4A CN112313314A (zh) | 2018-08-13 | 2019-04-11 | 煤用抗氧化剂和煤的抗氧化方法 |
TW108123678A TW202020131A (zh) | 2018-08-13 | 2019-07-04 | 煤用抗氧化劑及煤的抗氧化方法 |
PH12020552209A PH12020552209A1 (en) | 2018-08-13 | 2020-12-17 | Antioxidant for coal and method for preventing oxidation of coal |
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- 2019-04-11 US US17/266,109 patent/US20210292674A1/en not_active Abandoned
- 2019-04-11 EP EP19849474.2A patent/EP3800235A4/en not_active Withdrawn
- 2019-04-11 KR KR1020217001413A patent/KR20210020140A/ko not_active Application Discontinuation
- 2019-04-11 WO PCT/JP2019/015786 patent/WO2020035973A1/ja unknown
- 2019-07-04 TW TW108123678A patent/TW202020131A/zh unknown
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KR20210020140A (ko) | 2021-02-23 |
US20210292674A1 (en) | 2021-09-23 |
EP3800235A1 (en) | 2021-04-07 |
CN112313314A (zh) | 2021-02-02 |
TW202020131A (zh) | 2020-06-01 |
PH12020552209A1 (en) | 2021-06-28 |
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