Preparation of MoS2/RGO and its flame-retardant finishing effect on polyester fabrics
In recent years,the fire risk associated with textile combustion has increasingly drawn people's attention,leading to higher demands for flame-retardant safety in textiles.Polyester terephthalate(PET)possesses properties such as high strength,high temperature resistance,abrasion resistance,corrosion resistance,and light resistance.Therefore,it has been widely used in military,agricultural,industrial,and textile fields.However,PET fabrics are highly flammable and generate toxic gases and dense smoke when burned,causing significant loss to human life and property.This exacerbates the hazards of fires.Consequently,conferring good flame retardancy and smoke suppression properties to PET fabrics holds great practical significance and application value in achieving low-smoke,halogen-free flame retardancy in PET textiles.Graphene is a two-dimensional(2D)honeycomb nano-material composed of sp2-hybridized carbon atoms.It has garnered considerable attention due to its well-known properties,including superior mechanical strength,extremely high carrier mobility,and excellent thermal conductivity.Graphene has been successfully applied in various fields.Particularly,graphene exhibits high thermal stability.Compared with existing flame retardants,graphene and its derivative,reduced graphene oxide(RGO),are considered environmentally friendly halogen-free flame retardants that can improve the flame retardancy of polymer composites.However,the flame-retardant effect of a single agent is limited,especially in suppressing the dense smoke generated during the combustion of PET.The inhibitory effect of graphene-based flame retardants is not ideal.To address this,we introduce molybdenum disulfide nano-materials.Molybdenum disulfide nano-materials prepared by hydrothermal method exhibit excellent thermal stability and can maintain the stability of the layered structure at higher temperatures,thus exerting the barrier effect of the layered structure.The transition metal molybdenum promotes the formation of a char layer during fabric combustion,accelerating the formation of a dense carbon layer,which acts as a physical barrier,slowing down the heat and mass transfer during the combustion process,and improving the flame retardancy of the fabric.Additionally,molybdenum elements can suppress smoke,effectively reducing the toxicity and smoke density of the fabric during combustion,thereby providing more valuable time for fire escape and rescue.Amolybdenum disulfide/reduced graphene oxide(MoS2/RGO)composite material was prepared by using a hydrothermal method,and the PET fabric was then treated by a dip-padding process.The structure and properties of the MoS2/RGO composite material and the MoS2/RGO-modified PET fabric were characterized by using scanning electron microscopy,transmission electron microscopy,Raman spectroscopy,infrared spectroscopy,smoke density chamber,and cone calorimeter.The results showed that the MoS2/RGO composite material was well coated on the fabric.The thermal stability of the treated PET fabric was significantly improved,with a 35.3%increase in residual char yield compared with pure PET fabric at 700℃.The limiting oxygen index of the fabric modified with MoS2/RGO reached 28.2%,which was 8.9%higher than that of the pure PET.The total heat release rate decreased by 60.5%compared with the pure PET fabric,and the smoke density was reduced by 56.9%compared with the pure fabric.The modified fabric achieved self-extinguishment in vertical burning tests,and the char length decreased to 10.6 cm.After treatment,the contact angle of the PET fabric decreased to 0° at 2.2 s,effectively improving the wearing comfort of PET.
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