Polímeros: Ciência e Tecnologia
https://revistapolimeros.org.br/article/doi/10.1590/S0104-14282006000300013
Polímeros: Ciência e Tecnologia
Scientific & Technical Article

Avaliação das Propriedades Termo-Mecânicas de Borracha Nitrílica após Ensaio de Compatibilidade de acordo com ASTM D 3455

Thermal - Mechanical Properties Evaluation of Nitrilic Rubber after Compatibility Test according to ASTM D 3455

Pinto, Carlos Eduardo da S.; Wasilkoski, Cleuza; Tomczak, Fábio; Oliveira, Suely M. de; Souza, Gabriel P. de; Meyer, Adailze L.

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Resumo

O copolímero butadieno – acrilonitrila – NBR é comumente aplicado na confecção de gaxetas e anéis de vedação para transformadores elétricos isolados a óleo mineral. Durante o uso esses materiais permanecem em contato com óleo em temperaturas próximas a 90 ºC provocando alterações físicas e químicas no material elastomérico e no óleo. Neste trabalho, estudou-se a variação das propriedades mecânicas do elastômero resultantes do ensaio de compatibilidade (ASTM D 3455)[³]. A caracterização mecânica foi realizada por ensaios de resistência a tração, dureza e análise dinâmico-mecânica (DMA). A verificação da estabilidade térmica e a composição do NBR foram obtidas através de análise termogravimétrica (TGA).

Palavras-chave

Gaxetas - NBR, compatibilidade óleo mineral, ensaio mecânico

Abstract

The copolymer of acrylonitrile and butadiene - NBR is commonly used to manufacture gaskets and seals to be used in electrical transformers insulated by mineral oil. During operation those materials are constantly in contact with oil at temperatures that can reach 90 ºC, causing physical and chemicals changes in both gaskets and oil. In this paper the changes in elastomer mechanical properties after the compatibility test were studied (ASTM D 3455)[3]. This characterization was done by tension properties, hardness and dynamical mechanical analysis (DMA). The evaluation of thermal stability and composition of the NBR was carried out through thermogravimetry analysis (TG).

Keywords

NBR gaskets, mineral oil compatibility, mechanical tests

References



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2. Hofmann, W. – “Rubber Technology”, 2ª Ed., Hanser Publishers, New York (1996).

3. American Society for Testing and Materials, ASTM D3455- 95 – “Standard Test Methods for Compatibility of Construction Material with Electrical Insulating Oil pf Petroleum Origin”. 1995. Annual Book of ASTM Standards, vol.10.03, Philadelphia (1995).

4. American Society for Testing and Materials, ASTM 2240- 91– “Test Method for Rubber Property – Durometer Hardness”. 1995. Annual Book of ASTM Standards, vol .09.01, Philadelphia (1995).

5. American Society for Testing and Materials, ASTM D412- 97a “Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers-Tension”. 1995. Annual Book of ASTM Standards, vol. 09.01, Philadelphia (1995).

6. American Society for Testing and Materials, ASTM E 2254- 03– “Standard Test Methods for Storage Modulus Calibration of Dynamics”. 1995. Annual Book of ASTM Standards, vol. 14.02, Philadelphia (1995).

7. American Society for Testing and Materials, ASTM E1867- 01– “Standard Test Methods Temperature Calibration of Dynamics Mechanics”. 1995. Annual Book of ASTM Standards, vol. 14.02, Philadelphia (1995).

8. American Society for Testing and Materials, ASTM D 6370– 99 - “Standard Test Method for Rubber- Compositional Analysis by Thermogravimetry (TGA)”. 1995. Annual Book of ASTM Standards, vol.09.01, Philadelphia (1995).

9. American Society for Testing and Materials, ASTM D2000- 90– “Standard Classification System for Rubber Products in Automotive Applications”. 1995. Annual Book of ASTM Standards, vol. 09.01, Philadelphia. (1995).

10. American Society for Testing and Materials, ASTM D395-97 - “Stand Test Methods for Rubber Property - Compression Set”. 1995. Annual Book of ASTM Standards, vol. 09.01, Philadelphia. (1995).
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