| In recent years,people's pace of life has accelerated,work pressure is high,and the white-haired population is becoming younger.In addition,the problem of aging in China has become increasingly prominent,and the demand for hair dye has increased,which has greatly promoted the development of the hair dye market in China.However,the current market for chemical hair dyes is still not standardized.More than 60% of the unqualified cosmetics released by the National Medical Products Administration in recent years are hair dyes,and counterfeit cosmetics continue to appear.The existence of a large number of products that endanger human health has made the unsafe hair dye market more serious.Therefore,the search for green and safe new hair coloring materials has become a major trend in the future hair coloring agent market.This paper uses Silk fibroin nanofibers(SNF)and graphene oxide(GO)to prepare a Silk fibroin nanofibers/graphene oxide composite(SNF /GO).It is hoped that it can achieve certain application value in the future hair dye market.In this paper,silk fibroin nanofibers and graphene oxide were used to prepare silk fibroin nanofibers/graphene oxide composites,and the hair dyeing process and performance were systematically studied.The results are as follows:1?Firstly,the improved Hummers method was used to successfully prepare micronano-scale sheet-like graphene oxide with wrinkle structure,which can be uniformly dispersed in aqueous solution.Then,through a typical dissolution-dialysiscentrifugation-concentration process,a silk fibroin nanofiber solution is prepared and uniformly dispersed.Based on the obtained two raw materials,the silk fibroin nanofiber/graphene oxide composite material was finally obtained through homogeneous emulsification under hydrothermal conditions,and optimized preparation process.2?The effects of factors such as the concentration ratio,the reduction method of graphene oxide,the soaking time,the soaking temperature,and the number of dyeing times on the dyeing effect of SNF/GO composite materials were investigated by using a single factor method,and the optimal preparation method was obtained In order to add the ratio of silk fibroin nanofibers: graphene oxide = 1.5: 1,reduction was performed using vitamin C as a reducing agent,the concentration of vitamin C was 5.0 mg/m L,the immersion temperature was 35?,the immersion time was 10 minutes,and the number of dyeings was 2 for 4 h.Finally,the hair dryer dries.3?Through pure water and shampoo washing experiments,it was verified that the thin layer of SNF/GO composite material formed on the surface of the hair bundle can block the long-term dyeing effect.The MTT175 hair test system was used to test the hair tress samples before and after the material treatment,and it was verified that the tensile resistance and combability were better than those when not treated.Finally,the safety of the composite was verified by patch tests and skin residue experiments.The above experiments showed that the SNF/GO composite has good performance in hair dyeing.4?It was observed by SEM that other hair dyeing materials would damage the hair,and the SNF/GO material could form a uniform coating and adhere to the surface of the crust.By observing the cross-sectional shape of the hair,the composite material will not penetrate and damage the inside of the hair bundle,ensuring the healthy structure of the hair.Finally,through Raman spectroscopy analysis,there are characteristic peaks of graphene oxide,which means that the SNF/GO composite material covers the surface of the hair,and the thin layer of graphene material changes the color of the hair bundle to achieve the effect of blackening white hair. |
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