Study On The Effect Of Sebum Pollution On Fabric Yellowing

At present,studies have shown that sebum contamination is the main factor causing clothing yellowing,but the research on sebum contamination in different environmental factors and the presence of mold is still insufficient,which has become a bottleneck problem in the field of textile washing and care to clarify the yellowing mechanism of sebum contaminated fabrics and to develop technology and equipment to inhibit clothing yellowing.To this end,Jiangnan University and Wuxi Little Swan Electrical Appliances Co.,Ltd.have cooperated in the research of clothing storage after wearing to study the yellowing mechanism of sebum contaminated cotton,polyester and silk fabrics under different environmental conditions and fungal contamination conditions,to inhibit or prevent the yellowing of cotton,polyester and silk fabrics.Firstly,the single sebum component was selected,and the sebum contamination solution was prepared by using squalene,oleic acid,and triolein,respectively,and the cotton,polyester and silk fabrics were padded to prepare the sebum contaminated fabric samples.To discuss the influence of environmental factors on the yellowing of sebum contaminated fabric samples,the samples were placed in a constant temperature and humidity chamber and a climate aging instrument to study the microclimate environmental changes and the yellowness index and reflectivity were used to characterize the degree of fabric yellowing,and the effects of temperature,humidity,light intensity,air content and storage time on the yellowing of samples were discussed.The results showed that after 180 days of storage,the peaks of alkanes and alkenes of squalene decreased,while the peaks of hydroxyl,carbonyl and C-O bonds increased,which suggested that the oxidation products of squalene might contain alcohols,ketones,or aldehydes.The yellowing of the sample treated by high temperature and strong light in short-term microenvironment was the most obvious after long-term storage,and the yellowness index was as high as 12.75.After 240 days of sealed storage,some samples showed visible yellowing,and with the increase of storage time,the yellowing accumulation of the fabric increased,and the yellowness index was up to 29.54.Secondly,collecting real yellowing clothes,separating,purifying and sequencing the fungi on the real yellowing clothes and selecting three fungal microorganisms which can produce yellow substances on the sebum polluted fabrics,namely Aspergillus chevaliers,Epicoccum nigrums and Talaromyces rugulose.Single-factor variable analysis was designed to make cotton,polyester and silk fabrics contaminated by sebum with or without fungi,and the fabrics were stored in different temperature and humidity conditions for 20 days as a cycle to discuss the influence of fungi,sebum,temperature and humidity on the yellowing of cotton,polyester and silk fabrics.The results showed that the growth of mold could be observed only after 15 days at 30? and 95% relative humidity,After 20 days,the yellowness index of cotton,polyester and silk fabric samples increased significantly,and obvious yellowing was visible to the naked eye;After 20 days of this condition,Aspergillus chevaliers grew most on the fabrics contaminated by 4% triolein,Epicoccus nigerians grew most on the fabrics contaminated by 4% triolein and Talaromyces rugulosus grew most on fabrics polluted by 4%squalene.With the increase of sebum concentration,the growth of mold and the degree of yellowing on three kinds of fabrics increased.Finally,three commonly used bacteriostatic agents,namely zinc sulfate,potassium sorbate and sodium benzoate,were selected to inhibit the growth of different fungi under the optimal conditions,and it was considered that they could also inhibit the growth of fungi under other conditions,thus slowing down the yellowing of fabrics.The results showed that the bacteriostatic effect of bacteriostatic agents on fungi on sebum contaminated fabrics was in the order of sodium benzoate > calcium propionate > zinc sulfate.The bacteriostatic agent had the strongest inhibitory effect on the cotton fabric samples,especially on Aspergillus chevaliers,and the reduction rate of the yellowing degree of the samples was 87.80 %.The bacteriostatic agent had the second inhibitory effect on Epicoccum nigrums,and the reduction rate of the yellowing degree of the samples was 84.24 %.The bacteriostatic effect on Talaromyces rugulosus was the least,and the decrease rate of yellowing degree was 80.82 %.