Study On Short Process Printing And Dyeing Processing And New Weight Gain Technology Of Silk Floss

Silk floss is a collection of silk fibers made from cocoons processed through the process of peeling cocoons and playing floss,and is often made into floss,silk quilts,etc.Silk floss fiber has attracted the attention of researchers because of its good mechanical properties,biocompatibility and degradability.Silk floss fiber production and processing to remove impurities such as grease and silk gum for the important process,this process to improve the performance of silk fiber has an important role,however,today the silk floss fibers pretreatment process is not perfect,the quality of silk fiber is not guaranteed;silk floss fiber application is single,affecting the development of silk floss fiber products;the production process is cumbersome resulting in environmental pollution and waste of resources and other problems that limit the wide application of silk floss fiber.Therefore the development of the short process processing of silk floss fibers is particularly important.To this end,this paper aims to improve the processing and performance of silk floss and to expand the application of silk floss as a starting point,based on the traditional pretreatment process of silk floss,we designed a one-bath pretreatment solution to optimize the pretreatment process of silk floss.Based on the market demand for gold-like cocoons,we develop a short process pre-treatment printing and dyeing process based on the pre-treatment residual alkali agent for silk floss with high color fastness dyeing process and performance analysis,giving silk floss high value.Finally,the silk protein solution was prepared using waste silk fibers,and then the properties of phytic acid were used to improve the taking properties of silk floss based on multi-dentate chelated silk protein weighted silk floss.The details and results of the study are as follows:(1)One-bath pretreatment process and performance analysis of silk floss:The APEO-free(Alkylphenol polyoxyethylene ether),highly efficient degreaser plus alkali agent combination process was used to treat silk floss fibers in a short one-bath pretreatment method.The pretreatment process was optimized based on conventional pretreatment process using response surface testing.The results showed that the optimal pretreatment process was obtained from the response surface optimization experiment:the silk floss original sample was immersed in a pretreatment solution consisting of 2.7 g/L high-efficiency protein fiber degumming/degreasing agent,1.6 g/L sodium carbonate,40 g/L 30%hydrogen peroxide,and 3.4 g/L sodium silicate for degumming,refining and bleaching,and the mass ratio of pretreatment solution to the dry weight of the bulk fiber was 30∶1,and the treatment was shaken at 100℃for 2 h.The pretreatment of silk floss fibers under the optimal process could effectively remove silk glue and oil,with a reduction rate of 17.67%and a whiteness of 86.35.Compared with the conventional pretreatment of silk floss fibers,the quality was improved,and the silk floss fibers thus pretreated were completely degummed with almost no damage to the fibers.(2)High color fastness dyeing process and performance analysis of silk floss based on pretreatment residual alkali agent in the same bath method:A short process for dyeing silk floss fibers with reactive dyes at low dose and low damage was developed based on the optimal pretreatment process for silk floss fibers,specifically using the one-bath method for pretreatment of silk floss fibers,followed by dyeing the fibers with reactive dyes,and analyzing the dyeing performance and color fastness index of reactive dyes on silk floss fibers,and comparing with golden cocoon silk.The results showed that the silk floss fiber was completely the silk dyed with 3RS reactive yellow and 3BS reactive red composite dyes had almost the same L~*,a~* and b~* values as the golden cocoon,and also had higher dyeing fastness,and the color depth did not drop significantly after 5 times of washing and soaping,and the color difference value was kept within 2.0.Because the pretreatment process provides the pH required for dyeing silk floss fibers,on the one hand,the alkaline environment prompts alkaline ionization of silk proteins,and at the same time increases the electron cloud density of the phenolic hydroxyl neighboring carbon in the structure of silk tyrosine residues,which provides a nucleophilic substitution reaction between the monochloro homotriazine structure dye and tyrosine residues and amino groups,forming covalent bonding and enhancing the dyeing fastness.On the other hand,the dyeing process does not require additional alkali addition,which reduces the damage of alkali to silk floss fibers.The dyeing process conforms to the quasi-quadratic kinetic model.The results of this study provide an experimental basis and theoretical support for the development of a short process dyeing process for colored silk cocoons such as high color fastness class golden cocoons.(3)Multi-dentate chelation-based silk protein weight gain process and performance analysis of silk floss:This paper uses waste silk to prepare silk protein solution,and in the use of phytic acid solution and its chelation weight gain,this process is not only green and weight gain effect is better.The weight gain of the silk floss fibers was 5.87%and 8.10%for the silk floss fibers weighted by the silk protein solution and the silk floss fibers weighted by the multi-tooth chelated silk protein solution,respectively.The whiteness and gloss of the weighted silk floss fibers were almost the same as those of the pretreated silk floss fibers,indicating that the weight gain did not affect the whiteness and gloss of the silk floss fibers,and the weight gain did not affect the main structure of the silk floss fibers.The combination of regenerated silk protein with silk floss fibers led to a decrease in thermal stability,while the multi-dentate chelated silk protein solution slightly enhanced the thermal stability of silk floss fibers due to the function of phytic acid.