Red phosphorus coating for flame retardant treatment of fabrics
Başlık çevirisi mevcut değil.
- Tez No: 800000
- Danışmanlar: DR. EUGENİO GİBERTİNİ
- Tez Türü: Yüksek Lisans
- Konular: Metalurji Mühendisliği, Metallurgical Engineering
- Anahtar Kelimeler: Red Phosphorus, Flame Retardant, Sol-gel, Coating, Fabrics
- Yıl: 2020
- Dil: İngilizce
- Üniversite: Politecnico di Milano
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 119
Özet
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Özet (Çeviri)
In this thesis, encapsulation of red phopshorus particles by silica shell formation was investigated. Aim of the work was improvement of flame retardant properties of three fabrics, that have different flammabilities, provided by company Prosetex. In contrast with conventional toxic halogen-based flame retardants, red phosphorus was used as promising less toxic and flame retardant efficient compound. Besides improvement of flame retardant properties, phosphine gas releasing of red phosphorus was aimed to be restricted. For this purpose, firstly, red phosphorus particles were encapsulated by relatively simple sol-gel process with TEOS as a main precursor. Two different sol-gel process, that are two-step and acidic processes, performed to find best method for coating of particles and two-step sol-gel process was decided as more effective coating process. For the additional improvement of coating around particles and flame retardancy, phosphorus particles were functionalized with dopamine before silica shell coating. Also, as another approach, lignin which is bio-based carbon source was added into the sol-gel process to enhance char formation during the combustion process. Produced powders were structrally and morphologically characterized by FTIR and SEM. Then, thermal properties were investigated by TGA and DSC analysis. According to this, exothermicity of the pyrolysis reaction was reduced for all particles and residual amount of material was quite improved with respect to the pristine red phosphorus. For standard SiO2@Red P, residual weight was increased 7-fold and peak temperature was shifted from 425 °C to 441 °C. Also, in TGA graph, weight increment was observed and it was attributed to the oxidation of phosphorus. After the thermal analysis, produced powders were coated on the back of each fabrics with doctor blade and flame retardancy effect on the fabrics were tested by BS 5852 Part 1 standard test. According to the flame test, standard coating process resulted in best flame retardancy performance among three different approach. Flame tests was successfully passed on fabric 1 which consists of mostly cotton and fabric 2 which is viscous, more critical fabric.
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