| With the continuous improvement of people’s living level and the environmental awareness,cotton is favored by the public because of its advantages of wearing comfortable, renewable andbiodegradable. At the same time, along with the strengthening of health awareness, people’sdemands for clothing are not only limited to appearance and wearing comfort. They also puthigher requirements for additional functions, such as durable press (DP) and antibacterium.Therefore, the study of the compound functional treatment with formaldehyde-free easy-care＆antibacterium of cotton fabrics has important significance. They can not only meet the demands ofconsumers, but also improve the added value of the fabric.Three aspects of the thesis were studied in this paper. Firstly, BTCA, which was used as a DPfinishing agent, together with AGP, a kind of silver antibacterial agents, were used in thecompound functional treatment of cotton fabrics. In order to reduce the cost, AGP wascompounded by two kinds of cheap antibacterial agents then. Secondly, the non-ironing finishingeffect and antibacterial effect were studied when BTCA and polysaccharides such as chitosan withdifferent molecular weights were treated on cotton fabrics. At last, the best one from differentkinds of commercial antibacterial agents was chosen, the optimal treatment process wasdetermined, and the technology was used in industrial production. The wrinkle resistance angle ofcotton fabrics should not be less than260.0°. The tear strength retention rate should be more than55.0%, and the bacterial reduction rate should reach to90.0%. All the technical indexes mentionedabove were the targets of this project.First of all, this project was launched on the basis of previous research of our team, and it wasdetermined that BTCA was used as a DP finishing agent. Cotton fabrics were treated by BTCAand AGP, which is a kind of commercial antibacterial agent, in one-bath process. The experimental results showed that the wrinkle resistance angle of cotton fabric reached to263.1°, the tearstrength retention rate was more than60.0%, and the bacterial reduction rate reached to99.3%when the concentration of AGP was20.0g.L-1in the experiment. Of course, the results reached theprimary targets of the project, but the price of AGP was very high. In order to reduce the cost,AEM5700and GC-G018W were chosen to compound with AGP. But the experimental resultsshowed that it did not exhibit antimicrobial synergistic effects when AGP was compounded withAEM5700or GC-G018W. The bacterial reduction rates were59.5%and87.0%, respectively. Inother words, the antimicrobial effect and the DP effect of cotton fabrics were not ideal.Secondly, the DP effect and antibacterial effect of cotton fabrics were discussed when cottonfabrics were treated by BTCA and a kind of polysaccharide in one-bath process, such as chitosanwith diffident viscosities (>400.0mPa.s,200.0-400.0mPa.s,<200.0mPa.s). The experimentalresults showed that chitosan with low viscosity exhibited good antimicrobial effect and creaseresistance effect. Chitosan with low viscosity which was screened from the previous experimentswas degraded under diffident time, and the molecular weights of chitosan were calculated out. Therelationship between the molecular weight of chitosan and its properties of antibacterial＆anti-wrinkle was explored through these experiments. The results showed that the degradedchitosan (M≈39000.0) had better properties of antibacterium and anti-wrinkle, and the bacterialreduction rates was56.1%. At the same time, it exhibited excellent antimicrobial synergisticeffects when AGP was compounded with β-CDs. The fabrics had excellent antibacterial effect, andthe bacterial reduction rate reached to99.8%for S.aureus, but the crease recovery angle of thefabric was244.2°, the tearing strength retention rate were54.3%in the warp direction and51.5%in the weft direction, in a word, the DP effect was not ideal.Finally, on the basis of above researches, some cheap antibacterial agents were selected andthe focus was put on the exploration of the finishing process. Through the comparison of twodifferent processes, it is found that the durable press finishing agent and the antibacterial agentwould impact each other in one-bath process, and the multi-functional finishing effects were notideal. On the contrary, the effects were great when cotton fabrics were treated by DP finishingagent and antibacterial agent in two-bath process. Based on the experiments, the fact that SCJ2000had excellent antimicrobial effect under acidic (BTCA) conditions was also found, and the optimaltreatment process of BTCA and SCJ2000was picked out. The experimental results showed thatthe crease recovery angle of fabrics reached to260.0°, and the bacterial reduction rate reached to99.0%for S.aureus when cotton fabrics were treated by BTCA and SCJ2000. The further researchwas conducted on several factors which had great influence on the final results, such as theconcentrations of BTCA and SCJ2000, the crosslinking temperature and time, the pH value of theBTCA solution. The optimal process and recipe were applied in industrial production at last, and the results showed that the tear strength of cotton fabrics met a criterion of market requirementand the expected goal, the bacterial reduction rate reached to98.0%for S.aureus and the DP levelreached to3.4. |
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