Preparation and properties of flame-retardant polyester-cotton fabrics with chitosan-based intumescent flame retardant system
Objective Polyester/cotton(T/C 65/35)fabrics have been widely used in both clothing and industrial fields,because of their great moisture absorption and breathability associated with cotton fibres and good mechanical property provided by polyester fibres.However,T/C fabrics are extremely flammable and hard to be flame-retardant,because the special "scaffolding effect" of polyester and cotton can arise violent flame,large amount of heat and copious smoke.Therefore,T/C fabrics used in public places such as curtains,need to meet the flame-retardant requirements to can reduce the fire risk.Method To prepare polyester/cotton(T/C,65/35)fabrics that are flame-retardant and meet practical application requirements,chitosan(CS)and γ-piperazinyl propylmethyl dimethoxy silane(GP-108)were utilized to prepare flame-retardant T/C fabrics through one-step dip-coating method,and the micromorphology,thermal stability,flame retardancy,tensile strength,flame-retardant mechanism and whiteness of T/C fabrics and flame-retardant T/C fabrics were studied.Results The results showed that PCS/GP coatings successfully formed a film on the surface of T/C fabrics and enveloped both polyester and cotton fibers.T/C-PCS/GP exhibited a typical thermal degradation process of polyester-cotton fabrics with char residues value of 28.5%retained at 700℃,indicating that the PCS/GP coatings improved the thermal stability of flame-retardant T/C fabrics in the high temperature zone.The LOI value of T/C-PCS/GP was increased to 26.5%,achieving self-extinguishing during the vertical flame test(VFT).The scanning electron microscopy(SEM)photos of char residues after VFT showed that PCS/GP eliminated the scaffolding effect of polyester-cotton fabrics.The peak heat release rate and fire growth index of T/C-PCS/GP were decreased by 20%and 40%respectively compared with those of T/C fabrics,indicating a significant reduction in fire hazard.The SEM pictures of char residues after CCT showed that polyester in T/C fabrics was completely melted,while T/C-PCS/GP kept the original shape of fibers and presented perfect intumescent flame-retardant char layers.T/C-PCS/GP underwent the thermal degradation processes in advance compared with T/C fabrics,because of the catalysis effect of phosphoric acid.However,T/C-PCS/GP released less volatiles at the maximum thermal degradation temperature and barely no gas products release during the high temperature zoon.T/C-PCS showed decreased tensile strength compared with T/C,while owing to the addition of GP-108,T/C-PCS/GP obtained better tensile strength compared with T/C-PCS.Meanwhile,the use of GP-108 solved the yellowing problem of T/C-PCS and increased the whiteness of T/C-PCS/GP.Conclusion The results showed that an eco-friendly flame-retardant coating had deposited on the surface of T/C fabrics which presented ideal flame retardancy,mechanical property and whiteness.PCS/GP coatings are capable of endowing T/C fabrics with great flame retardancy through establishing instrument flame-retardant char layers after heating.Fortunately,T/C-PCS/GP showed decreased fire hazard.For the utilization of GP-108,the damage of tensile strength associated with PCS had been avoided and the whiteness of T/C-PCS/GP was better than that of T/C-PCS.The design of PCS/GP was hopeful to provide more stratagems for the intumescent flame-retardant system with environmental materials.Meanwhile,the application of silane agent solved the decreasing tensile strength and whiteness owing to PCS.This work was lack of analysis containing the original properties of T/C,such as hand feeling,which played a key role on the practical application of flame-retardant T/C.
万方数据
维普
