The Study And Application Of Anti-crease Finishing Of Cotton Fabrics Based On Oxidized Sucrose

Among many types of anti-crease finishing agents,the application of 2D resin is the most common.This kind of resin can make the fabric have a good anti-crease effect,however,fabrics treated with such resins will release free formaldehyde during processing,storage,transportation,and wearing,which seriously endangers human health and does not conform to the development trend of green and healthy.With the growing common voice of environmental protection and healthy development,great progress has been made in the research and application of formaldehyde-free anti-crease finishing agent.In this paper,the highly specific selective oxidation characteristics of the hydroxyl structure of o-diols with periodate are used to selectively oxidize sucrose with sodium periodate to obtain a polyaldehyde-containing bio-crosslinking agent,oxidized sucrose.and oxidized sucrose is used in anti-crease finishing of cotton fabrics,the cross-linking mechanism between oxidized sucrose and cellulose fibers and a reasonable anti-crease finishing system were studied.Firstly,by exploring the effects of different p H values,reaction temperature and time on the aldehyde group content in the reaction system,the appropriate reaction conditions were selected to prepare oxidized sucrose.According to the experimental results,the p H value of the reaction system was controlled at 4.0±0.1,and the sucrose and sodium periodate were prepared by the light-avoiding reaction at 1:3 molar ratio of 20°C for 20h.After the reaction product is precipitated with barium chloride,it is purified by ion exchange resin to remove the remaining iodate and periodate in the solution.The chromogenic reaction of the product with Schiff's reagent confirmed that aldehyde groups were generated in the solution,and the infrared spectroscopy?FTIR?showed that a new characteristic absorption peak of aldehyde group appeared at 1728cm^-1,indicating that the secondary hydroxyl group of sucrose was successfully oxidized to Aldehyde group indicating that the secondary hydroxyl group of sucrose was successfully oxidized to aldehyde group.Two strong peaks of m/z 337 and m/z307 measured by liquid chromatography mass spectrometry?HPLC-MS?,which had the same molecular weight as the two ideal structures of the target product,and the relative abundance of the former is significantly lower than the latter,indicating that sodium periodate mainly has a double oxidation reaction on the three o-alcohol hydroxyl groups on the?-D glucose ring of sucrose.In addition,the aldehyde hydrogen at?8.46 ppm on nuclear magnetic resonance spectroscopy?¹H NMR?indicated that sucrose was oxidized by sodium periodate to form sucrose derivatives containing aldehyde,the hydrogen spectrum in the form of hemiacetal that appears around?5.0 ppm indicates that during the preparation,purification,and freeze-drying of oxidized sucrose,the product undergoes intermolecular acetalization to produce hemiacetal structures.It can be seen that the structure of oxidized sucrose product is very complicated.Secondly,the obtained oxidized sucrose solution is used for anti-crease finishing of cotton fabrics.The effects of the type and amount of catalysts,p H value of finishing solution,baking temperature and baking time on the crease resistance of cotton fabric were investigated by the traditional process of padding-drying-baking process.Using magnesium chloride as a catalyst can make the fabric have better resilience performance,and the whiteness and strength retention of the fabric are also within acceptable ranges.Combining single-factor test and orthogonal test analysis,the influence of each factor on the anti-wrinkle effect of the fabric is as follows:the amount of catalyst>baking temperature>finishing solution p H value>baking time,the best anti-crease finishing process for oxidized sucrose finishing fabric is obtained:the amount of catalyst is 30g/L,the p H value of the finishing solution is3.0,the baking temperature is 170°C,and the baking time is 150s.Finally,the compound of magnesium chloride and citric acid is used as a mixed catalyst for the anti-crease finishing of oxidized sucrose on cotton fabrics.The addition of citric acid improves the crease recovery performance of the finished fabric to a certain extent.and citric acid and magnesium chloride have a synergistic effect.However,the acidity of citric acid will have a negative effect on the whiteness and strong retention rate of the fabric.It is found through experiments that the optimal mixing ratio of citric acid and magnesium chloride is 2:1,and the anti-crease effect is better when the baking temperature is 160°C and the baking time is 120s.Compared with the anti-crease effect of glyoxal and low formaldehyde resin DM-3510,the anti-crease effect of oxidized sucrose is relatively poor,and the dimensional stability of the washed fabric after oxidized sucrose finishing is not good.The self-crosslinking problem of oxidized sucrose may be the main reason for restricting the improvement of anti-crease effect,and further research is needed.