NBR/ACMブレンドのデュアル加硫システムによる最適化と変圧器シールへの適合性
1Guangdong Provincial Key Laboratory of Electric Power EquipmZent Reliability, Electric Power Research Institute of Guangdong Power Grid Co., Ltd. Guangzhou, Guangdong 510080, China.
ACS omega
|January 8, 2026
まとめ
本研究では、変圧器シール用にニトリルゴム(NBR)/アクリレートゴム(ACM)ブレンドを最適化しました。最適なブレンド(NBR:ACM 90:10)は、優れた機械的特性、耐熱性、およびオイル適合性を示し、シールの寿命を延ばします。
科学分野:
- 材料科学; 高分子化学; 機械工学
背景:
- 変圧器のシール材には、優れた機械的特性と熱安定性が必要です。既存の材料では、変圧器の要求される運転条件を満たせない場合があります。ニトリルゴム(NBR)とアクリレートゴム(ACM)は、高度なシール材の候補となります。
研究 の 目的:
- 変圧器シール用途向けのニトリルゴム(NBR)/アクリレートゴム(ACM)ブレンドの設計と調査。包括的な特性を強化するための最適なブレンド比率の決定。シミュレートされた変圧器運転条件下での最適化ブレンドの性能評価。
主な方法:
- デュアル加硫システムを使用した、さまざまな比率のNBR/ACMブレンドの調製。加硫特性、機械的特性(引張強度、破断伸度、弾性率、硬度)、熱安定性、耐油性、低温シール性能の体系的な評価。熱空気老化(125°C×168時間)および変圧器油老化(125°C×168時間)を含む経時劣化試験。
主要な成果:
- NBRとACMの比率はブレンド特性に大きく影響します。最適な性能はNBR:ACMが90:10のブレンドで達成され、高い引張強度(21.15 MPa)、破断伸度(276%)、硬度(71 Shore A)に加え、優れた耐熱性を示します。90:10ブレンドは、経時劣化後、最小限の体積変化(2.8%)と変圧器油特性への影響の少なさ(酸価の上昇0.03 mg KOH/g)を示し、低温シール性(-20°C)も安定しています。
結論:
- 90:10 NBR/ACMブレンドは、変圧器シールに適した機械的強度、熱安定性、耐油性のバランスの取れた特性を提供します。この最適化されたブレンドは、材料アップグレードの実用的なソリューションを提供し、シールの寿命を延ばし、メンテナンスコストを削減します。開発された材料は、変圧器内の複雑なシール環境に効果的に対応し、油汚染と劣化を最小限に抑えます。
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