wt 35 wt 3035 wt JIS K wt 60 wt DSC RADEX 30 wtarc 60 wt 2.2DSC DSC TA Instruments DSC mg 10 min 5 MPaSUS MPa

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1 290 DSC 2 ARCRADEX DSC RADEX RADEX 1. Fenton Kumasaki DSCC 80ARCRADEXVSP2, PHI TECH RSST Liaw PHI TECH 6 Shu VSP2 7 Iizuka N. N. 8 Uchida 9 DSC 2 ARC RADEX wt

2 wt 35 wt 3035 wt JIS K wt 60 wt DSC RADEX 30 wtarc 60 wt 2.2DSC DSC TA Instruments DSC mg 10 min 5 MPaSUS MPa SUS MPa0 200 TA Instruments 0.3 MPa MPa mm 1.0 mm 1 mg α 6.7 mm 3.6 mm DSC DSC 1 Fig.1 2 AZ SiO 2 Fig SiH 2 NH + 2H 2 OSiO 2 NH 3 2H wt Fig wt mm10 mm Vol. 47No

3 292 t 0.5 mm ARCAccelerating Rate Calolimeter 1 Dow Chemical 4 φ 1 M b C vb M s C vs M b M S C vb C vs 11 9 ml SUS304 1 g heatwait search 2 TIAX ARC min SUS304 SUS304 SUS nm 12 1 g 1 g SUS SUS RADEX 1 SYSYTAG ARC min 0.55 mwg Fig.3 TR Pt 100 Ω SUS ARC RADEX

4 293 RADEX RADEX Fig. 3 b SUS MPa ARC 2.5 cc Fig.3 b RADEX SYSTAG 13 ARC 2 SYSTAG RADEXV5 ARC min 30 min g 7.22SUS RADEX SUS316 5 mm15 mmt 0.1 mm DSC 3.1.1DSC Fig.4 30 wt SUS303 SUS303 Fig.5 Suh TiO 2 SiO 2 α Al 2 O 3 Au Auα Al 2 O 3 TiO 2 SiO 2 14 SUS304 SUS303 Vol. 47No

5 294 過酸化水素の危険性評価における容器材質の影響 イ容器に比べ約 20 高くなった これはガラスキャ ピラリーを使用した場合とほぼ同じ開始温度である 同結果より この試料容器は過酸化水素の熱的危険性 評価では有効である 耐熱性は 200 までなので 200 までの熱挙動の評価について適用可能である 一方 ガラスコーティング容器では 期待したよう な結果ではなく 低い温度で分解がはじまっている Fig. 7 に 焼成後 DSC 測定に使用する前の容器表面 を光学顕微鏡で観察した様子を示す 容器はコーティ ング膜には亀裂があり 膜の状態が不均一であること がわかった このため亀裂内部の金属が測定に影響を 与えている 亀裂が入った要因として コーティング ルや銅を使用する 本実験に使用した金メッキ容器に 剤の焼成温度が 450 と高温であることが挙げられ はこれらの下地メッキとしてニッケルを使用してい る このような高温ではガラスとハステロイの熱膨張 る また メッキの表面にはピンホールが存在する可 率の違いにより亀裂が生じやすい 触媒の入ったコー 能性が高く 封孔処理を行っていない場合 下地のニッ ティング剤であれば もっと低温で焼成できるが 触 ケルあるいは素地の SUS303 が過酸化水素の分解に影 媒が過酸化水素水の分解に影響を与える可能性があ 響を与える 以上より 過酸化水素の熱的危険性を評 る また 容器表面には切削痕が目立つ 切削痕のあ 価するときに用いる容器として 金属容器やメッキ容 る容器表面も亀裂を生じやすいため 表面を平滑にす 器は適していない る必要がある また DSC 測定の感度が落ちないよう DSC 測定では ガラスキャピラリー容器を使用した に 可能な限り薄くコーティングする必要がある ガ 場合が最も発熱の開始温度が高くなった この容器は ラスキャピラリー容器の結果からガラスの有効性は確 容器材質として有効であるが 耐圧性に乏しく 過酸 認できているので 新規の容器材質として ガラスコー 化水素水のような反応して気体を発生する試料の仕込 ティング容器は有効である み量は少なくなってしまう そのため Fig. 4 に示すと おり 発熱ピークはなだらかな曲線となり発熱開始温 度の判定が困難となる また試料の作製作業には手間 がかかり 迅速な前処理を必要とする試料測定には向 かない 容器へのコーティング効果の検証 ネッチ製ハステロイ容器にテフロンあるいはガラス コーティングを施した試料容器にて 30 wt 過酸化 水素水の熱挙動を検討した結果を Fig. 6 に示す テ フロンコーティングでは 発熱の開始温度がハステロ 3.2 断熱熱量計による評価 ARC 4 種類の金属容器 チタン SUS304 ハステロイ 不動態化 SUS304 を用いて 60 wt 過酸化水素水の 熱挙動を検討した結果を Fig. 8 に示す いずれも熱 挙動が異なった 最も発熱検知温度が低いのはチタン 容器を使用した場合であった チタンでは発熱検知後 40 分ほどで温度上昇速度が最大となった 発熱開始温度は 不動態化 SUS304 SUS304 ハス テロイ チタンの順に低くなった 発熱検知から最大 安 全 工 学

6 295 SUS304 SUS304 ARC ARC SUS304 ARC SUS RADEX 30 wt SUS316 Fig.9 ARC 30 wt 70 RADEX 50 SUS316 SUS304 SUS316 ARC RADEX SUS304 SUS316 RADEX SUS wt kpa 48 Pa 15 DSC ARC RADEX 95 RADEX 4. DSC SUS303 SUS303 DSC 200 DSC ARC 4 SUS304 SUS304 SUS304 RADEX SUS316 RADEX Vol. 47No

7 296 DSC RADEX DSC ARC AZ 1H. J. H. Fenton M. A. Oxidation of tartaric acid in presence of iron, J. Chem. Soc., Trans., 65, pp Urben. P. G.Brethericks handbook of reactive chemical hazards 5th ed., pp , Butterworth Heinemann, London J. MackenzieHydrogen peroxide without accidents, Chem. Eng., pp pp M. KumasakiAn explosion of a tank car carrying waste hydrogen peroxide, J. Loss Prev. Pros. Ind., 19, pp Horng Jang Liaw, Ching Chir Yur, Yung Fen LinA mathematical model for predicting thermal hazard data, J. Loss Prev. Pros. Ind., 13, pp C. M. Shu, Y. J. YangUsing VSP2 to separate catalytic and self decomposition reactions for hydrogen peroxide in the presence of hydrochloric acid, Thermochim. Acta, , pp pp pp ARC 1989 Ipp pp. I 2 6 I Systag ther mal analysis, systag. c h/ E_400_TA. html 14M. Suh, P. S. Bagus, S. Pak, M. P. Rosynek, and J. H. LunsfordReactions of Hydroxyl Radicals on Titania, Silica, Alumina, and Gold Surfaces, J. Phys. Chem. B, 104, pp pp Effect of Material of Vessels on Exothermal behavior of Aqueous Hydrogen Peroxide by Isao Eto, Miyako Akiyoshi, Ken Okada and Takehiro Matsunaga The effect of vessels material on exothermic behavior of aqueous hydrogen peroxide has been investigated by DSC and adiabatic calorimeters ARC and RADEX. For the DSC tests, the vessels materials considered are titanium, Hastelloy, stainless steel, pure gold, gold plating, and glass. We also have attempted to evaluate a vessel coated with Teflon and that lined with glass. For the ARC tests, vessels made of titanium, Hastelloy, SUS304 and passivated SUS304 has been used. For the RADEX tests, a SUS316 chip or a Hastelloy chip is put into the standard inner vessel made of glass. The exothermic decomposition temperatures and their induction periods have been compared. As a result, all metal materials catalyze and accelerate the decomposition. Especially, titanium and gold plating vessels show a remarkable effect. The glass vessel should be inert and proper, because it has given the highest decomposition temperature. The glass lining vessel and the Teflon coated vessel would be applicable, when sufficient quality vessels will be manufactured in the near future. Key wordshydrogen peroxide, Thermal hazard evaluation, vessel material Research Core for Explosion Safety, National Institute of Advanced Industrial Science and Technology AIST1 1 1Higashi, Tsukuba, Ibaraki , JAPAN Present Contact Address, Process & Production Technology Center, Sumitomo Chemical Co., Ltd.5 1, Sobiraki cho, Niihama City, Ehime , JAPAN Research Core for Explosion Safety, National Institute of Advanced Industrial Science and Technology AIST1 1 1Higashi, Tsukuba, Ibaraki , JAPAN

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