Preparation And Color Rendering Properties Of Structural Color Textile Material Based On Polydopamine

At present,the coloring of textiles is mostly achieved by dyeing and printing.The wastewater producing by dyeing and printing industry contains a large amount of dyes,auxiliary agents,acid-base regulators and heavy metal ions,which cause serious pollution to the environment.Structural colorization is one of the effective ways to realize the environmental-friendly textile coloring.However,there are still some disadvantages of structural color textiles,such as low color saturation,poor colorfastness,easy cracking and so on.In view of this,polydopamine(PDA)was used as the color-developing film or the shell layer of the core-shell microspheres,the color saturation of structure color on the surface of white fabric was enhanced resulting from the light absorption characteristics of black PDA.The self-made epoxy-containing structural color adhesive was used to bind the structural color layer and the fabric to form covalent bond,thus to improve the structural color colorfastness and reduce structural color cracking.The specific research is as follows:(1)Preparation of PDA structure color film on cotton fabric:Using glycidyl methacrylate(GMA)and polyethylene glycol methacrylate(PEGMA)as monomers to prepare P(GMA-co-PEGMA)adhesive containing epoxy groups by free radical polymerization.Cotton fabric was used as a representative,the PDA structure color film was prepared by using the self-polymerization property of dopamine(DA)and settled on the white cotton fabric to study the color performance of PDA film attched to cellulosic fabric.FT-IR,EDS and NMR results showed that GMA and PEGMA were copolymerized to produce P(GMA-co-PEGMA).TG data showed that the copolymer had good thermal stability.It was found that the increase in self-polymerization time leads to an increase in the thickness of the PDA film,and the structural color gradually redshifted,showing the colors in the order of gold-brown-blue-green.The addition of P(GMA-co-PEGMA)adhesive can enhance the interfacial binding strength between the PDA film and fabric,resulting in improving the colorfastness of the structural color fabric.(2)Preparation of PDA structure color film on silk fabric:Silk fabric was used as a representative,the color rendering effect of PDA film attched to protein fabric which was different structure from cellulosic fabric was studied,and the relationship between fiber structure and fabric structural color was discussed.The results showed that the increase in self-polymerization time leads to an increase in the thickness of the PDA film,and the structural color gradually redshifted,showing the colors in the order of silver-gold-purple-blue-green.Compared with cotton fabric,the PDA film attched to silk fabric was smoother and more continuous.However,the reactive groups on the surface of silk hindered the self-polymerization of DA,resulting in a slower change in the thickness and color of PDA film.P(GMA-co-PEGMA)adhesive also had a extraordinary effect on improving the colorfastness of PDA film on silk fabric surface.(3)Preparation of SiO2@PDA structure color fabric by gravitational sedimentation:The hydrophobicity of structural color adhesive was improved by introducing hydrophobic monomer of hexafluorobutyl methacrylate(FHBMA).SiO2 microspheres were synthesized by sol-gel method,and SiO2@PDA microspheres were prepared using PDA as black light absorbing substance.SiO2@PDA microspheres were deposited on white polyester fabric by gravity sedimentation,and five different colors of amorphous photonic crystal structural color fabrics were obtained.FT-IR,EDS and NMR results showed that GMA,PEGMA and HFBMA were copolymerized to produce P(GMA-co-HFBMA)-g-PEGMA.TG results showed that the copolymer possessed good thermal stability.The prepared SiO2 microspheres in the experiment had uniform particle size and good monodispersity.With the increase of DA amount,the Si02@PDA microsphere size increased and the fabric structure color redshifted.However,the excessive amount of DA would make the microsphere appearance rough,resulting in the decrease of the size and uniformity,the monodispersity of microspheres,the order of crystal structure and the brightness of structure color.The addition of P(GMA-co-FHBMA)-g-PEGMA could inhibit structural color cracking and improve its colorfastness.(4)Preparation of structure color fabric by atomized deposition:Monodisperse SiO2 microspheres with regular morphology and uniform particle size were prepared by sol-gel method.The structure color fabric was prepared by depositing SiO2 microspheres on the surface of black polyester fabric by atomized deposition.The results showed that the prepared structural colorized fabric by atomized deposition had uniform color.Adding a small amount of P(GMA-co-HFBMA)-g-PEGMA adhesive can not only improve the rubbing colorfastness and washing colorfastness of the fabric structural color,but also enhance the brightness of the structural color.