| In recent years,with the development of people's living standard, they pay more attention to healthy and cozy. As a necessities of people's daily life,the safety of cloth is more and more important. Cotton fibers are the most important fibers in the apparel industry, since they can readily absorb moisture and cotton-made clothes are the most comfortable garment. Despite the numerous advantages, there are also some shortcomings, such as easy wrinkling of fabric in practical application. Crushing during use and care(such as washing) cause wrinkles. Water absorption during washing leads to the movement of the molecular chains of cellulose in amorphous and intermediate(non-crystalline) region. The new arrangement of the cellulosic material is modified by the hydrogen bonds between the adjacent hydrogen groups. N-methylol agents have long been used by textile industry as durable press finishes producing wrinkle-resistant cotton fabrics. However, they release formaldehyde either from treated fabrics or during finishing processes, their use in textile industries is limited. Formaldehyde is identified to impair human's health. So the research on formaldehyde-free durable press finishing for cotton fabric is of great significance.In this paper, a kind of cotton fabric formaldehyde-free durable press finishing agent is synthesized by emulsion polymerization method. On the premise of the same of finishing process, the synthetic process of finishing agent is optimized. Single factor analysis showed that when keeping the finishing process conditions for the concentration of finishing agent for 150 g/L, the catalyst for sodium hypophosphite, catalyst concentration for 50 g/L, curing temperature for 170 ?, curing time for 120 s, the best finishing agent synthesis conditions is the maleic acid and acrylic acid molar ratio for 1:1, reaction temperature for 85 ?, the reaction time for 2.5 h. And then we have done the 3 factors 3 levels orthogonal experiment, the best synthetic conditions of finishing agent are the same of single factor optimization. And Application properties of cotton textile treated with finishing agent at different molecular weight were studied, we found that with the increasing of the molecular weight of finishing agent cotton fabrics crease recover angle gradually increases first and then decreases.After complete the synthesis conditions for synthesis of finishing agent, we studied the best finishing process. Single factor analysis showed that when the concentration of finishing agent for 125 g/L, the catalyst for sodium hypophosphite, the concentration of catalyst for 40 g/L, the curing temperature for 170 ?, the curing time for 150 s, cotton will get the best easy care. The application properties of red cotton textile treated with acrylamide at different concentrations has been studied. Single factor analysis showed that when concentration of acrylamide for 30 g/L, red cotton will get the best easy care.At last, the easy-care mechanism of this kind of finishing agent has carried on preliminary discussion through the modern instrument analysis. SEM images, TG and elemental analysis showed some attachment are bound to the surface of cotton fiber finished with finishing agent. FT-IR spectra revealed the formation of an ester linkage, indicating the cross-linking the cellulosic material. By testing the elastic modulus of cotton fabric before and after the treatment, we found that the elastic modulus of cotton fabric treated with PMAAA has been increased greatly. Through the test of the cotton fabric by XRD, we found that the crystallinity of cotton fabric treated with PMAAA has been increased. |
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