Influence of expanded vermiculite on fire protection of intumescent fireproof coatings for steel structures

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• 作者：Yadong Xue (1)
  Shiping Zhang (2)
  Wenliang Yang (1)
  
  1. Department of Geotechnical Engineering ; Tongji University ; 1239 Siping Road ; Shanghai ; 200092 ; China
  2. College of Mining Engineering ; Taiyuan University of Technology ; 79 Yingze West Main Street ; Taiyuan ; 030024 ; China
  
• 关键词：Intumescent ; Fireproof coating ; Expanded vermiculite ; Thermal degradation ; Fire protection
• 刊名：Journal of Coatings Technology and Research
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：12
• 期：2
• 页码：357-364
• 全文大小：1,422 KB
• 参考文献：1. ISO-834, / Fire Resistance Tests鈥擡lements of Building Construction. International Standard ISO 834, Geneva, 1975
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Tribology, Corrosion and Coatings
  Surfaces and Interfaces and Thin Films
  Polymer Sciences
  Materials Science
  
• 出版者：Springer US
• ISSN：1935-3804

文摘

The effects of expanded vermiculite (EV) as modified filler to improve fire protection of intumescent fireproof coatings have been studied. It was found that the fire protection and char structure of the coating was significantly improved by adding 7% EV (by mass) into the coating. The results showed that the flaky structure of EV could promote the expansion and carbonization of the coating under fire, which could reinforce the heat-insulation performance of the char layer and reduce its corrosion at high temperature. The X-ray diffraction and thermogravimetry results indicate that additional EV may increase the thermal decomposition temperature of the coating and enhance the antioxidation performance of the char layer at high temperature. However, the study also shows that the excessive amount of EV with flaky structure will lead to the nonuniform diffusion of the nonflammable gases in the melting char under fire and will depress the fire protection and expansion performance of the coating.