Preparation And Charactristic Of Aluminum Hydroxide Sol Coating Onto Polysulfonamide Fabric

Green and environmental protections are the industrial development tendencies in the current world. As people getting more and more aware of environmental protection and healthy, there are a lot of new green flame retardants, such as aluminum hydroxide or magnesium hydroxide, has been widly used as inorganic fire retardanct, due to its non-halogen, non-toxic and non-volatile properties. And, because of its smoke-retardant and smoke abatement properties, it becomes more and more important in the fire retardants and co-fire retardants aspect. Generally, the fire retardant properties become increased with the addition of inorganic fillings. However, an insuitable compatibility can be achieved between the inorganic filling and polymer matrix, so, the bigger addition, the harder dispersion, resulting in the decrease of processability and mechanical properties of the composite. So, in this work, a novel flame retardant fabric material, which is combined with inorganic flame retardant and organic thermostable polymer fiber, is investigated to be prepared with aluminum hydroxide sol coating onto Polysulfonamide (PSA) fabric.In this work, the coating of aluminum hydroxide sol onto the surface of PSA fabric was prepared by in situ and sol-gel method without any additives and agents. Firstly, modified PSA fabric with sodium hydroxide to obtain-COO- on the surface, then controlled the reaction condition of aluminum chloride and aqua ammonia to adsorb the positive aluminum hydroxide sol on the PSA surface. Finally, the Aluminum Hydroxide/Polysulfonamide (ATH/PSA) composite material was obtained. The flame retardant and fire-proofing of inorganic flame/organic fiber system is improved due to the decomposition reaction of aluminum hydroxide. The influence of different concentrations and different growth times on the element content, surface morphological characteristic, fire proofing, fire retardancy and mechanical property of ATH/PSA composite material were discussed in detail. The composite material was characterized by inductively coupled plasma atomic absorption (ICP), scanning electron microscopy (SEM), vertical burning test, thermal conductivity test, thermo-gravimetric analysis (TGA) and tensile strength test. The better conditions of aluminum hydroxide onto the surface of PSA fabric were finally confirmed as follow.When the molar ratio of aluminum chloride and aqua ammonia was 4:5, and the growth time was 10 days, the composite material presents the highest aluminum content, the lowest thermal conductivity and the best fire retardancy. The vertical burning test results also revealed the burned length of ATH/PSA is as 30.61% as the one of original PSA fabric.In this work, we also prepared Aluminum Hydroxide/Magnesium Hydroxide/PSA (ATH/MH/PSA) composite material. Lamellar Mg(OH)2 (MH) crystalline film on the modified PSA fabric surface was obtained by secondary crystallization method, which was Magnesium Hydroxide/PSA(MH/PSA). Then Al(OH)3 sol was successfully coated onto its surface by in situ growth method, which was Aluminum Hydroxide/Magnesium Hydroxide/PSA(ATH/MH/PSA) composite material. The characterization of ATH/MH/PSA composite material was evaluated by Inductively coupled plasma atomic absorption (ICP), scanning electron microscopy (SEM), vertical burning test, thermo-gravimetric analysis (TGA) and UV-VIS-NIR Spectrophotometer, which confirmed that it is feasible to apply composite inorganic fire retardant aluminum hydroxide and magnesium hydroxide onto the fabric.