Application of color fastness improvement of roselle-red dyed silk fabrics by coating and crosslinking
With the progress of society,people pay more and more attention to their health and the surrounding living environment.Consequently,there is a growing demand for ecological and environmentally friendly functional dyed textiles among consumers.However,conventional textile dyeing often involves the use of synthetic dyes that contain harmful chemicals to the human body.These dyes are not easy to degrade and are prone to causing a series of health hazards and environmental pollution.Therefore,the concept of sustainable development has led to renewed interest in non-toxic,harmless,and naturally degradable natural plant dyes.Roselle-red(MGH)is a kind of natural pigment extracted from the calyx of solanum roseum.It is green,safe,and has antibacterial and antioxidant effects.It has found extensive application in food preservation and medical healthcare.Because of its bright color and inherent functionality,it is often used for dyeing silk fabrics,but due to the lack of affinity between silk fibers,the dyeing rate is not high.In order to promote its dyeing effect,some heavy metal ionic mordants are commonly used for mordant dyeing.Although this method can effectively improve the dyeing and fixation of natural pigments on silk fabrics,these mordants are usually toxic,and there are potential environmental pollution problems.Moreover,after dyeing the fabric,the color fastness is not high,especially the washing fastness is poor.Therefore,it is necessary to develop a new method to improve color fastness.To solve the problems such as low color fastness and poor washing resistance of the silk fabric after dyeing,the rigid and flexible properties of acrylic monomer copolymerization can be used to improve the molecular aggregation structure and the enrichment degree of hydrophobic elements on the fiber surface,so as to achieve the purpose of film coating.A kind of polyacrylate polymer was synthesized from methyl methacrylate,butyl acrylate,2-hydroxyethyl methacrylate and methyl acryloxypropyl tri(trimethylsiloxanyl)silane.Then,the treated fabric was immersed in glutaraldehyde solution to achieve the purpose of chemical cross-linking.Subsequently,the polymer was used as a fiber coating material for natural roselle-red dyed silk fabrics.Finally,the double effect of color fastness and waterproofing was significantly improved by using the three functions of fast coating,water penetration resistance and chemical bonding.The results of IR spectra show that the pigment and finishing agent have been successfully introduced into the structure of silk fibers by the coating crosslinking of PAMES and GA.SEM results show that there is a coating layer on the surface of the fiber after waterproofing and crosslinking,and the presence of silicon in EDS analysis results further proves that PAMES has been successfully coated on the fiber surface.In the thermal stability test,the maximum thermal degradation temperature of the finished silk fabric and the original silk fabric moves to 327.77 ℃,while the peak value of thermal degradation decreases significantly,indicating that the deposition coating of PAMES has a certain effect of hindering heat transfer.The result of water contact angle test shows that the finished silk fabric has obvious hydrophobic property.The mechanical properties of finished silk fabrics are significantly improved,and the color fastness of the silk fabric is obviously improved after treating and dyeing.The wet fastness is increased from grade 2-3 to grade 4,and the soap fastness is increased from grade 1-2 to grade 3-4.The treated fabric exhibits good waterproof effect,and the water contact angle increases from being close to zero to 125°.The mechanical properties are significantly improved,with breaking strength increasing from 8.73 MPa to 26.37 MPa.By using the coating cross-linking method,the polymer(PAMES)as the fiber coating material is applied to the silk fabric dyed with roselle-red pigment,which enhances the stability of natural roselle-red pigment,and effectively improves the color depth and color fastness of silk fabrics.Thus,the polymer has a broad application prospect,and also provides a technical route for other natural vegetable dyes dyed silk fabrics.
万方数据
维普
